A sample of n = 9 scores is randomly selected from a population with m = 80 and s = 9. if the sample mean is m = 83, then the corresponding z-score is z = +3.00.
a. True
b. False

Answers

Answer 1

so false would be your answerA sample of n = 4 scores has a mean of M = 8. If one new score with a value of X = 3 is added to the sample, what will be the value for the new mean?A. M=7.0A normal distribution has a mean of μ = 70 with σ = 12. If one score is randomly selected from this distribution, what is the probability that the score will be greater than X = 58?A. 0.8413On an exam with μ = 52, you have a score of X = 56. Which of the following values for the standard deviation would give you the highest position in the class distribution?σ = 2Under what circumstances is a score that is 15 points above the mean an extreme score relatively far from the mean?When the population standard deviation is much smaller than 15For a sample of n = 16 scores, how many scores are used to calculate the sample variance?D. 16A normal distribution has a mean of μ = 80 with σ = 20. What score separates the lowest 30% of the distribution from the rest of the scores?B. X=69.6A normal distribution has a mean of μ = 100 with σ = 20. If one score is randomly selected from this distribution, what is the probability that the score will have a value between X = 80 and X = 100?B. 0.1587If sample variance is computed by dividing SS by df = n - 1, then the average value of the sample variances from all the possible random samples will be ____ the population variance.C. exactly equal toA population of N = 6 scores has ΣX = 12 and ΣX2 = 54. What is the value of SS for this population?C. 30One sample has n = 4 scores and M = 10. A second sample has n = 6 scores and M = 5. If the two samples are combined, then what is the weighted mean for the combined sample?C. 70/10 = 7.0A jar contains 10 red marbles and 30 blue marbles. What is the probability of randomly selecting a red marble from the jar?B. 10/40After every score in a sample is multiplied by 3, the mean is calculated and found to be M = 21. What was the mean for the original scores?A. 7John drives to work each morning and the trip takes an average of μ = 38 minutes. The distribution of driving times is approximately normal with a standard deviation of σ = 5 minutes. For a randomly selected morning, what is the probability that John's drive to work will take less than 35 minutes?D. 0.2743Scores on the SAT form a normal distribution with a mean of μ = 500 with σ = 100. If the state college only accepts students who score in the top 60% on the SAT, what is the minimum score needed to be accepted?A. X=475Which of the following symbols identifies the population standard deviation?C. σA sample of n = 100 scores is selected from a population with μ = 80 with σ = 20. On average, how much error is expected between the sample mean and the population mean?C. 2 pointsWhat happens to the standard error of M as sample size increases?B. it decreasesIf all the possible random samples with n = 36 scores are selected from a normal population with μ = 80 and σ = 18, and the mean is calculated for each sample, then what is the average of all the sample means?C. 80A sample of n = 4 scores has a standard error of 10 points. For the same population, what is the standard error for a sample of n = 16 scores?C. 5A population has μ = 50. What value of σ would make X = 55 a more central, representative score in the population?D. σ = 20A researcher measures eye color for a sample of n = 50 people. Which measure of central tendency would be appropriate to summarize the measurements?C. modeA distribution is positively skewed. Which is the most probable order, from smallest to largest, for the three measures of central tendency?B. mode, median, meanFor the population of scores shown in the frequency distribution table, the mean is ____.

X f
5 2
4 1
3 3
2 2
1 2D. 29/10 = 2.90Samples of size n = 9 are selected from a population with μ = 80 with σ = 18. What is the standard error for the distribution of sample means?C. 6For a particular population, a sample of n = 9 scores has a standard error of 8. For the same population, a sample of n = 16 scores would have a standard error of ____.B. 6For a sample with M = 80, a score of X = 88 corresponds to z = 2.00. What is the sample standard deviation?B. 4You have a score of X = 65 on a math exam. The mean score for the class on the exam is μ = 70. Which of the following values for the standard deviation would give you the most favorable position within the class?D. σ = 10A true/false test has 100 questions. Using the normal approximation to the binomial distribution, what is the probability of getting more than 55 correct by just guessing?B. p(X > 55.5)What term is used to describe the shape of a distribution in which the scores pile up on the left-hand side of the graph and taper off to the right?B. positively skewedFor a population with μ = 80 and σ = 10, what is the X value corresponding to z = -0.50?C. 75What is the value of SS (sum of squared deviations) for the following population?
Population: 2, 3, 0, 5A. 13

Answer 2

The statement "a sample of n = 9 scores is randomly selected from a population with m = 80 and s = 9 is false.

What is a normal distribution?

It's the probability curve of a continuous distribution that's most likely symmetric around the mean. On the Z curve, at Z=0, the chance is 50-50. A bell-shaped curve is another name for it.

It is given that:

A sample of n = 9 scores is randomly selected from a population with m = 80 and s = 9.

As we know,

Z = (x - u)/s

Z = 3

x = 83

s = 9

3 = (83 - u)/9

27 = 83 - u

u = 83 - 27 = 56

Thus, the statement "a sample of n = 9 scores is randomly selected from a population with m = 80 and s = 9 is false.

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Related Questions

Colin took out a loan with a principal of $32,800. After five years, the interest and principal totaled $48,872. If Colin made monthly payments of $816 for five years until the loan was paid off, how much did Colin pay in service charges? a. $16,072 b. $88 c. $16,160 d. $163

Answers

816 * 5 * 12= 48960

If the P and I totaled 48872, then...
48960 - 48872= 88

The service charges were $88 B.

The service charges would be, $88

What is mean by Subtraction?

Subtraction in mathematics means that is taking something away from a group or number of objects. When you subtract, what is left in the group becomes less.

Given that;

Colin took out a loan with a principal of $32,800.

And, After five years, the interest and principal totaled $48,872.

Now,

The value of principal amount is,

⇒ 816 × 5 × 12 = 48960

Now, We get;

Amount of Colin pay in service charges is,

48960 - 48872= 88

Hence, The service charges were $88

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The scores of adults on an iq test are approximately normal with mean 100 and standard deviation 15. clara scores 118 on such a test. she scores higher than what percent of all adults

Answers

The majority of the scores on the in test are between 85 to 115. This makes the mean 100 and the standard deviation 15. Anyone who scores above or below this range is ether more intelligent or less intelligent then the majority of participants in the test. Since Clara scored 118 she is smarter than most of the adults on this study.

a triangle is reflected across the line x=2. which of the following is true?
A. the image and pre-image have the same orientation.
B. the image and pre-image have different sizes.
C. the image and pre-image are congruent.
D. the image and pre-image are separated by a given angle.

Answers

Answer: C

Step-by-step explanation:

Answer:

C. the image and pre-image are congruent.

Step-by-step explanation:

a triangle is reflected across the line x=2

Check with each option

A. the image and pre-image have the same orientation.

The image will not be in same order

B. the image and pre-image have different sizes. the size will not change

C. the image and pre-image are congruent. the reflection will not change the size. so they are congruent

D. the image and pre-image are separated by a given angle.

The angles never change in reflection

how to write 412.638 using fractions

Answers

412 is a whole number, 638 is the number you want to look at.

your answer is 412 638/1000

or 412 63.8/100

hope this helps

That could be 412 and 319/500 .

Line ET is a tangent to circle A at point T and the measure of ∠TNG is 25°
What is the measure of ∠NET?

A) 130°
B) 50°
C) 65°
D) 90°

Answers

Answer:

C) 65°

Step-by-step explanation:

G ∈ NE, so ∠TNG = ∠TNE. ∠ATE = 90° because a radius (AT) is always perpendicular to a tangent line (ET) at the tangent point (T). A ∈ TN, so ΔTNG is a right triangle, and angles NET and TNE are complementary. Then ...

... ∠NET = 90° - ∠TNG

... = 90° - 25°

... ∠NET = 65°

Franco's Pizza is selling their pizzas 35% cheaper than usual if a pizza normally cost $12 how much is it now

Answers

Answer:

New or current cost = 12 - 4.2 = $7.8

Step-by-step explanation:

Franco's Pizza is selling their pizzas 35% cheaper than usual. This is a discount on the normal cost. To get the amount it costs now, we will find the percentage of the discount on the original cost and subtract what we get from the original cost.

Discount = 35℅

Original cost of pizza is $12 (if a pizza normally cost $12).

So the discount in terms of dollars

= ℅ discount / 100 × normal cost of pizza

= 35 / 100 × 12 =0.35 × 12 = $4.2

New or current cost of pizza would be normal or original cost - the discount in dollars.

New or current cost = 12 - 4.2 = $7.8

Final answer:

The pizza is now $7.80.

Explanation:

If Franco's Pizza is selling their pizzas 35% cheaper than usual, we can calculate the new price by multiplying the original price by (1 - 0.35).

So, the new price of the pizza would be $12 * (1 - 0.35) = $7.80.

Therefore, the pizza is now $7.80.

What us the equivalent ratio for 4:3

Answers

ratios can be written as fractions...so 4:3 is 4/3
an equivalent ratio would be the same as an equivalent fraction

to find equivalent fractions (ratios), multiply the numerator and denominator by the same number...

4/3 * 2/2 = 8/6.....so 8:6 is an equivalent ratio
4/3 * 3/3 = 12/9...so 12:9 is an equivalent ratio
4/3 * 4/4 = 16/12...so 16:12 is an equivalent ratio
etc...

A car is tracing at a rate of 72 kilometers per hour. What is the car rates in kilometers per min? How many kilometers will the car travel in 5 mins

Answers

1 hour= 60 minutes

72km/60 minutes= 1.2 km per minute

1.2(5)= 6 km

The car’s unit rate is 1.2 kilometers per minute and the car travel 6 kilometers in 5 minutes.

Hope this helps!

In 5 minutes, the car will travel 6 kilometers.

To convert the car's speed from kilometers per hour to kilometers per minute, we need to divide the given rate by the number of minutes in an hour, which is 60. So, for a car traveling at 72 kilometers per hour, the rate in kilometers per minute is:

72 km/hr / 60 = 1.2 kilometers per minute.

Now, to calculate how many kilometers the car will travel in 5 minutes, we simply multiply the rate in kilometers per minute by the number of minutes:

1.2 km/min * 5 min = 6 kilometers.

Therefore, the car will travel 6 kilometers in 5 minutes at the rate of 72 kilometers per hour.

Which function represents a reflection of f(x) = 5(0.8)^x across the x-axis?
g(x) = 5(0.8)^–x
g(x) = –5(0.8)^x
g(x) = (0.8)^x
g(x) = 5(–0.8)^x

Answers

Answer: The correct option is second.

Explanation:

The given function is,

[tex]f(x)=5(0.8)^x[/tex]

If we graph a function is f(x), then its coordinates is defined as (x,f(x)).

When the graph of f(x) is reflect across the x-axis, then the the x-coordinate remains the same and the sign of y-coordinate is changed. It means after reflecting across the x-axis,

[tex](x,y)\rightarrow(x,-y)[/tex]

The given given equation can be written as,

[tex]y=5(0.8)^x[/tex]

To find the equation of the graph after reflection across the x-axis multiply both sides by -1.

[tex]-y=-5(0.8)^x[/tex]

Because f(x)=y and g(x)=-y.

[tex]g(x)=-5(0.8)^x[/tex]

Therefore the second option is correct and the graph of both function is given below.

Answer:

B. g(x) = –5(0.8)^x

Step-by-step explanation:

We have the function, [tex]f(x) = 5(0.8)^x[/tex].

It is required to reflect the function about x-axis.

Now, as we know,

Reflection across x-axis will flip the graph of the function and the function [tex]f(x)[/tex] becomes [tex]-f(x)[/tex].

So, the reflection of [tex]f(x) = 5(0.8)^x[/tex] across x-axis will give the function [tex]f(x) = -5(0.8)^x[/tex]

So, we see that,

Option B i.e. [tex]g(x) = -5(0.8)^x[/tex] is correct.

How do you rename 4 thousands 7 hundreds = 47?

Answers

4 thousands 7 hundreds = 4700

hope this helps

if you meant decimals, it will be

0.047

What ratio correctly compares the measurements 10,000 cm to 1000 m? Drag and drop the appropriate numbers into the boxes to show the ratio in the simplest form.

Answers

Im sorry but what exactly are you looking for here?

Since there are 100 centimeters in every meter, 100cm/1m (or 1m/100cm) therefore equals one, and using the identity property we can multiply numbers by 1. Therefore, we can multiply 10000cm by 1m/100cm to get 100meters, which is 10000cm. As we want to compare 100 and 1000 meters, we can divide them to get 100/1000=1/10 (by dividing both the numerator and denominator by 100) as the ratio from 10000cm=100m and 1000m

Subtract using the number line. −4−(8)

Answers

The answer is -12 because the 4 and 8 are negative

Answer:

-12

Step-by-step explanation: I Took K12 TEST

what is 6 3/4 - 2 3/12=

Answers

Answer:

4.5

Step-by-step explanation:

What is the equation for the linear model in the scatter plot obtained by choosing the two points to the closest line?
y=-1.5 X +6
yEquals 1.5 X +6

Answers

(4,12) (20,36)
slope = (36 - 12)/(20-4) = 24 / 16 = 3/2 = 1.5

y intercept (0,6) b = 6
equation
y = 1.5x + 6

answer
b. y = 1.5x + 6

Final answer:

The equation for the linear model in a scatter plot can be determined by selecting any two points closer to the line and utilizing them to find its slope and y-intercept. This information is then used to write the equation y = mx + b, where m is the slope and b is the y-intercept.

Explanation:

The question pertains to the equation of the linear model in a scatter plot which basically describes the best fit line passing through the points on the plot. In simple terms, in a scatter plot if you choose any two points closer to the line, we can use these to determine the equation of that line.

Suppose you have two points (x1, y1) and (x2, y2), where x represents the independent variable and y is the dependent variable. To find the slope (m) of the line, we use the formula: m = (y2 - y1) / (x2 - x1). Once the slope is determined, we proceed to find the y-intercept (b), which is the y-value where the line crosses the y-axis.

The general form of a linear equation is y = mx + b. Hence, using the values of slope and y-intecept obtained earlier, we can write the equation of our line. For example, in the equations given in the question, -1.5 and 1.5 are the slopes and 6 is the y-intercept.

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Eight times the sum of 4 and some number is -56. What is the number?

Answers

8 (4+n)= -56
32+8n= -56
8n= -56-32
8n= -88
8/8n= -88/8
n= -11

About 11/12 of a golf course is in the fairways, 1/18 in the greens, the rest in the trees. What part of the golf course is in the trees?

Answers

That would be 1 - 11/12 - 1/18 = 36/36 - 33/36 - 2/36 = 1/36 answer

Which point does NOT lie on the graph of the line -2x + 5y = 20?
A. (-10, 0)
B. (0, 4)
C. (1, 4)
D. (5, 6)

Answers

The answer is C because all the other answer choices are true.

Using the following production tally, determine how many total mousetraps were produced during a shift:

Quantity per package: 60
Number of packages you sealed: 41
Starting quantity in first package (from previous shift): 52
Ending quantity in your last unsealed package (leave for next shift): 24
Rejected mousetraps: 34

Answers

2466
No. of Packages sealed
= (1 for PreviousShift) + (40 for MyShift) = 41.

PreviousShift top-up: (60-52)
MyShift sealed: (40x60) [for MyShift’s production only]
MyShift unsealed: 24
Rejected: 34

Total = 8 + 2400 +24 + 34
= 2466
i answered this question on yahoo as well

the fully shaded grid shows 1. EXPLAIN how these three models are related

Answers

They're all related because they all equal "one." The first one has 1/100, the second one has 10/100 and the third one has 100/100. They all relate because they all have ones.

Find the value of x (7x) (2x+27)
A. 7
B. 49
C. 61
D. 17

Answers

The value of x is 17.

To find the value of x when (7x) and (2x+27) are the two angles made on a straight line, we can use the fact that the sum of the angles on a straight line is 180 degrees.

Let's set up an equation:

(7x) + (2x+27) = 180

First, we simplify the equation by combining like terms:

9x + 27 = 180

Next, we isolate the variable x by subtracting 27 from both sides of the equation:

9x = 180 - 27

9x = 153

Finally, we solve for x by dividing both sides of the equation by 9:

x = 153/9

Simplifying the division gives us:

x = 17

Therefore, the value of x is 17.

Complete question :-

Find the value of x, if (7x) and (2x+27) are the two angles made on a straight line?
A. 7
B. 49
C. 61
D. 17

So, the value of x is not one of the given options A, B, C, or D.

To find the value of x in the expression (7x)(2x+27), we need to simplify the expression and solve for x.

Step 1: Distribute the 7x to both terms inside the parentheses:

(7x)(2x+27) = 14x^2 + 189x

Step 2: Set the expression equal to 0 and factor out common terms, if possible:

14x^2 + 189x = 0

Step 3: Factor out x:

x(14x + 189) = 0

Step 4: Set each factor equal to 0 and solve for x:

x = 0 (from the first factor)

14x + 189 = 0

14x = -189

x = -189/14

So, the value of x is not one of the given options A, B, C, or D.

Your Bank account balance was $235 and 24. After two checks were cashed (each for the same amount) your balance is now -45.58. What was the amount of each of those checks?

Answers

235.24 + 45.58 = 280.82

280.82/2 = 140.41

each check was 140.41

Write a linear equation that models the cost y of one person going on x rides at the fair. Graph the equation. Admission is $12 and rides are a $1 each. Please help

Answers

the equation is y=x+12 where action X represents how much rides were ridden total and 12 is the one-time admission fee

A sample is selected from a population with m = 50 and s = 12. if the sample mean of m = 56 produces a z-score of z = +1.00, then how many scores are in the sample? 2 4 9 16

Answers

Final answer:

The number of scores in the sample is 4.

Explanation:

The question provided asks us to determine the number of scores in the sample based on the z-score of +1.00, given a population with a mean (μ) of 50 and a standard deviation (σ) of 12.

The z-score formula for a sample is

z = (M - μ) / (σ / √n),

where

M is the sample mean, μ is the population mean, and σ is the population standard deviation, n representing the sample size.

We are given that M = 56, z = 1, μ = 50, and σ = 12.

To find the sample size (n), we use the formula and rearrange to solve for n:

z = (M - μ) / (σ / √n)1 = (56 - 50) / (12 / √n)1 = 6 / (12 / √n)√n = 12 / 6n = (2)^2n = 4

Therefore, the number of scores in the sample is 4.

How to do you simplify
1/5(40x^5+13x^3-3x-5)-(3x^5-5x^3+5x)

Answers

Greetings!

Simplify.
[tex]1/5(40x^5+13x^3-3x-5)-(3x^5-5x^3+5x)[/tex]
Distribute the Parenthesis.
[tex]8x^5+2.6x^3-0.6x-1-3x^5+5x^3-5x[/tex]
Combine Like Terms.
[tex]8x^5-3x^5+2.6x^3+5x^3-0.6x-5x-1[/tex]
The Answer Is:
[tex]5x^5+7.6x^3-5.6x-1[/tex]

Hope this helps.
-Benjamin

Surface area of a cylinder with a diameter of 14 and height is 9

Answers

The radius is 7 if the diam. is 14. We can find the surface area (without top or bottom areas) by finding the circumference of the base and then multiplying it by the height:

C=pi*d = pi(14); height = 9. Then the surface area of the side(s) is 14(pi)(9).

If you wish to include the areas of the top and bottom of the cylinder, add
2(pi)r^2 = 2(pi)(7)^2.

How do I FULLY answer this question. I have 2/4 marks

Answers

um you multiply then divide then subtract that from 5.

Lines AC and DF are parallel if Angles YBC and BEF are equal to each other and/or Angles ABY and YBC = 180 and/or Angles ABY and BEF = 180. So you'd do just that.

2x + 50 = 5x -55. By subtracting 2x from both sides and adding 55 to both sides, you get 3x = 105. x = 35.

Showing that 2(35) + 50 = 120 and 5(35) - 55 = 120 is enough to show that they are parallel.

Also another way would be adding x+25 and 2x + 50 and setting them equal to 180 like you did. OR as mentioned, 2x + 50 is the same angle as 5x - 55 so you can add 5x - 55 and x + 25 and set them equal to 180.

Isosceles triangles may be obtuse or acute but never right

Answers

False, because an isosceles triangle is a triangle that has two sides that are equal to each other. You can tell if a triangle is isosceles if two angles in the triangle are congruent to each other or equal. Angles in a triangle have to add up to 180 degrees. If one angle is 90 degrees then the other two other angles are 45 degrees which means the triangle is a right isosceles.

The statement, "Isosceles triangle may be obtuse or acute but not right", is a false statement.

Isosceles triangles can be defined as triangles that have two sides (angles) having equal measures.

Obtuse triangles have at least one angle greater than 90°.

Acute triangles have all three angles less than 90°.

Right triangles have one of the angles 90°.

Consider a right triangle ABC.

So, one of the angles, let it be A, will be right.

So, m ∠A = 90°.

By the angle sum property of triangles,

90° + m∠B + m∠C = 180°

m∠B + m∠C = 90°

Let both angles are having equal measures, let it be x.

x + x = 90°

2x = 90°

x = 45°

So, each of the angles has a measure of 45°, and so is an isosceles triangle since the two angles are equal.

So, a right triangle can be isosceles.

Hence the statement is false.

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Evaluate 11x-4 when x=_4

Answers

I'm not sure if that's x=4 or x= -4, but I'll solve both.
x=4:
11(4) - 4 = 44 - 4 = 40
x = -4:
11(-4) - 4 = -44 -4 = -48
Have an awesome day! :)

Just substitute 4 for x in 11x-4: 11(4)-4 = 44-4 = 40 (answer)

Find the equation of the line perpendicular to x−5y=15 that passes through the point (−2,5).

Answers

first off, let's solve x−5y=15 for "y".

[tex]\bf x-5y=15\implies x-15=5y\implies \cfrac{x-15}{5}=y\implies \stackrel{slope}{\cfrac{1}{5}}x-3=y[/tex]

now, notice the function in slope-intercept form, well, it has a slope of 1/5.

now, a perpendicular line to that one, will have a negative reciprocal to that, let's check what that is.

[tex]\bf \textit{perpendicular, negative-reciprocal slope for slope}\quad \cfrac{1}{5}\\\\ slope=\cfrac{1}{{{ 5}}}\qquad negative\implies -\cfrac{1}{{{ 5}}}\qquad reciprocal\implies - \cfrac{{{ 5}}}{1}\implies -5[/tex]

so, we're looking for the equation of a line whose slope is -5 and goes through -2,5.

[tex]\bf \begin{array}{lllll} &x_1&y_1\\ % (a,b) &({{ -2}}\quad ,&{{ 5}}) \end{array} \\\\\\ % slope = m slope = {{ m}}= \cfrac{rise}{run} \implies -5 \\\\\\ % point-slope intercept \stackrel{\textit{point-slope form}}{y-{{ y_1}}={{ m}}(x-{{ x_1}})}\implies y-5=-5[x-(-2)] \\\\\\ y-5=-5(x+2)\implies y-5=-5x-10\implies y=-5x-5[/tex]

1. Solve the given equation for y.

x - 5y = 15

-5y = -x + 15

y = (-x + 15)/-5

y = (x/5) - 3

y = (1/5)(x) - 3

The slope is 1/5. See it?

The equation we are looking for has a slope which is the negative inverse of the slope in the equation we just solved for y.

The slope for the equation we want is -5 which is the negative inverse of 1/5. Undetstand?

We have the slope of the new equation and one point is given.

Plot BOTH into the point-slope formula and solve for y. To solve for a variable means to isolate the variable ALONE on one side of the equation.

y - y_1 = m(x - x_1)...This is the point-slope formula. Our given point is (5,-2)

y - 5 = -5(x - (-2))

y - 5 = -5(x + 2)

We now solve for y and that's it.

y - 5 = -5x - 10

y = -5x - 10 + 5

The equation we want is y = -5x - 5.

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Please help me!! How do you solve 4x+8=2x+7+2x-20. Thank you

Answers

4x + 8 = 2x + 7 + 2x - 20

4x + 8 = 4x - 13

8 = -13

no solution.

hope that helps, God bless!

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A sample of n = 9 scores is randomly selected from a population with m = 80 and s = 9. if the sample mean is m = 83, then the corresponding z-score is z = +3.00. a. True b. False

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A sample of n = 9 scores is randomly selected from a population with m = 80 and s = 9. if the sample mean is m = 83, then the corresponding z-score is z = +3.00.
a. True
b. False