Consider a paint-drying situation in which drying time for a test specimen is normally distributed with σ = 9. the hypotheses h0: μ = 73 and ha: μ < 73 are to be tested using a random sample of n = 25 observations.

Answers

Answer 1
Part A:

The z score of the hypothesis testing of n samples of a normally distributed data set is given by:

[tex]z= \frac{x-\mu}{\sigma/\sqrt{n}} [/tex]

Given that the population mean is 73 and the population standard deviation is 9, then the number of standard deviation below the null value of x = 72.3 is given by the z score:

[tex]z= \frac{72.3-73}{9/\sqrt{25}} \\ \\ = \frac{-0.7}{9/5} = \frac{-0.7}{1.8} \\ \\ =-0.39[/tex]

Therefore, 72.3 is 0.39 standard deviations below the null value.



Part B:

The test statistics of the hypothesis testing of n samples of a normally distributed data set is given by:

[tex]z= \frac{x-\mu}{\sigma/\sqrt{n}} [/tex]

Thus given that x = 72.3, μ = 73, σ = 9 and n = 25,

[tex]z= \frac{72.3-73}{9/\sqrt{25}} \\ \\ = \frac{-0.7}{9/5} = \frac{-0.7}{1.8} \\ \\ =-0.39[/tex]

The p-value is given by:

P(-0.39) = 0.3483

Since α = 0.005 and p-value = 0.3483, this means that the p-value is greater than the α, ant thus, we will faill to reject the null hypothesis.

Therefore, the conclussion is do not reject the null hypothesis. there is not sufficient evidence to conclude that the mean drying time is less than 73.



Part C:

In general for the alternative hypothesis, [tex]H_a :\mu\ \textless \ \mu_0[/tex]

[tex]\beta(\mu') = P\left(X \ \textgreater \ \mu_0-z_{1-\alpha}\frac{\sigma}{\sqrt{n}}|\mu'\right) \\ \\ = 1-P\left(-z_{1-\alpha}+\frac{\mu_0-\mu'}{\sigma/\sqrt{n}}\right) [/tex]

So for the test procedure with α = 0.005

[tex]\beta(70) = 1 - P\left(-z_{0.995}+\frac{73-70}{9/5}\right) \\ \\ =1 - P(-2.5755+1.6667)=1-P(-0.9088) \\ \\ =1-0.1817\approx\bold{0.8183 }[/tex]



Part D:

For α = 0.005, and a general sample size n we have that

[tex]\beta(70) = 1 - P\left(-z_{0.995}+\frac{73-70}{9/\sqrt{n}}\right) \\ \\ =1 - P\left(-2.5755+ \frac{3}{9/\sqrt{n}} \right)[/tex]

Since, we want n so that β(70) = 0.01, thus

[tex]1 - P\left(-2.5755+ \frac{3}{9/\sqrt{n}} \right)=0.01 \\ \\ \Rightarrow P\left(-2.5755+ \frac{3}{9/\sqrt{n}} \right)=1-0.01=0.99 \\ \\ \Rightarrow P\left(-2.5755+ \frac{3}{9/\sqrt{n}} \right)=P(2.3262) \\ \\ \Rightarrow -2.5755+ \frac{3}{9/\sqrt{n}}=2.3262 \\ \\ \Rightarrow \frac{3}{9/\sqrt{n}}=4.9017 \\ \\ \Rightarrow \frac{9}{\sqrt{n}} = \frac{3}{4.9017} =0.6120 \\ \\ \Rightarrow \sqrt{n}= \frac{9}{0.6120} =14.7051 \\ \\ \Rightarrow n=(14.7051)^2=216.2[/tex]

so we need n = 217.



Part E

[tex]P-value=P(\bar{X}\leq\bar{x}) \\ \\ =P(\bar{X}\leq72.3)=P\left(z\leq \frac{72.3-76}{9/10} \right) \\ \\ =P\left(z\leq \frac{-3.7}{0.9} \right)=P(z\leq-4.111) \\ \\ =\bold{0.00002}[/tex]

Related Questions

jose rodriguez's checking account had a starting balance of 1,234.56. he wrote a check for 115.12 for plumbing supplies and check for 225.00 for a loan payment. Yesterday he deposited 96.75 in his checking account. what jose's current balance?

Answers

Jose's current balance is 991.12
Hopes this helps.


is the square root of 10 greater than,less than or equal to 5

Answers

It is less than five.

While going on a field trip, a busload of 54 students will have to be split up into three groups. two thirds will go to lunch first, and one third will go visit the exhibits. how many will go to lunch first?

Answers

*Given
Total number of students                                 - 54
Fraction of students going to lunch first           - 2/3
Fraction of students going to the exhibit first   - 1/3

*Solution
1. Since the students are grouped into 3, the total number of students must be divided into 3 to determine the number of students in each of the 3 groups.

                             54/3 = 18

Thus, there are 18 students per group. 

2. Two-thirds (2/3) of the total number of students will go to lunch first. Since the total number of students have already been divided into 3 groups, this simply means that 2 of the 3 groups will go to lunch first. Since each group has 18 students, 2 groups would have, 

                              18*2 = 36

Thus, 36 students will go to lunch first. 



Every year, a teacher surveys his students about the number of hours a week they watch television. In 2002, his students watched an average of 12 hours of television per week. In 2012, the number of hours spent watching television decreased to five per week. What is the percent decrease in the hours of television watched, rounded to the nearest tenth? 5.8% 4.2% 41.7% 58.3%

Answers

Answer:

58.3%  

Step-by-step explanation:

The percent decreased in the hours of television watched is 58.3%.

What is percentage?

A percentage is a number or ratio that can be expressed as a fraction of 100. Also called per centum. one one-hundredth part; 1/100. percentage.

Given that, in 2002, the students watched an average of 12 hours of television per week. In 2012, the number of hours spent watching television decreased to 5 hours per week

We need to find the percent decrease in the hours of television watched,

Percent decreased = Difference in the initial and final quantity / initial quantity × 100

Percent decreased = 12-5 / 12 × 100 = 7/12 × 100

= 58.3%

Hence, the percent decreased in the hours of television watched is 58.3%

Learn more about percentage, click;

https://brainly.com/question/29306119

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graph the linear equation. Find 3 points to solve the equations. -5x+2y=11

Answers

Sent a picture of the solution to the problem (s).

Ann had 75 fliers to post around town. Last week,
she posted 2/5 of them. This week, she posted 2/3 of the remaining fliers. How many fliers has she still not posted?

Answers

so, she had 75 fliers total, then she posted 2/5, how much is 2/5 of 75?  well, is just their product,

[tex]\bf 75\cdot \cfrac{2}{5}\implies \cfrac{150}{5}\implies 30 \\\\\\ \textit{how much is }\frac{2}{3}\textit{ of }\stackrel{remaining~75-30}{45}\textit{ fliers?}\qquad 45\cdot \cfrac{2}{3}\implies \cfrac{90}{3}\implies 30[/tex]

so, she had 75 total, she posted 30, then 30 again, so she hasn't posted 75 - 30 - 30.

At State College, the cost of tuition is $6168, housing is $3280, the meal plan is $2190, and books cost $1200. How much would you need to pay to attend State College for 4 years given your family will contribute $17,600?

Answers

Let's calculate the total cost per year:
6168 + 3280 + 2190 + 1200 = 12,838.
Four years will cost 12838 x 4 = 51,352
Your family will help you out with 17,600, so you will need to pay:
51352 - 17600 = 33,752

find the gradient of the line between each pair of points A(2,2) and B(6,6)

Answers

In other words, find the slope of the line connecting the points (2,2) and (6,6).
                                 6-2
This slope is m = ------------ = 1 
                                6-2

What is the unit rate for 822.6 km in 18 h? Enter your answer, as a decimal, in the box. ______.

Answers

You do 822.6 divided by 18
It is equal to 45.7
45.7 km per hour

we know that

A unit rate is a ratio between two different units with a denominator of one

In this problem to find the unit rate divide the total distance by the total time

so

[tex]\frac{822.6}{18} \frac{Km}{hours}= 45.7\frac{Km}{hour}[/tex]

therefore

the answer is

The unit rate is equal to [tex] 45.7\frac{Km}{hour}[/tex]

simplify the expression 4y - 1 - 3y + 2

Answers

okay, so basically all you need to do is combine like terms!
in this case, 4y and -3y are like terms... and -1 and 2 are like terms
so, 4y - 3y is 1y or y
and -1 + 2 is 1

so your simplified answer is y + 1

I hope this helps!!

A really bad carton of 18 eggs contains 9 spoiled eggs. an unsuspecting chef picks 6 eggs at random for his "mega-omelet surprise." find the probability that the number of unspoiled eggs among the 6 selected is

Answers

Final answer:

To find the probability that the number of unspoiled eggs among the 6 selected is X, we can use the hypergeometric probability formula. This formula is used when the sample drawn is without replacement from a finite population.

Explanation:

To find the probability that the number of unspoiled eggs among the 6 selected is X, we can use the hypergeometric probability formula. This formula is used when the sample drawn is without replacement from a finite population. In this case, we have 18 total eggs in the carton, with 9 spoiled eggs. So the probability that X unspoiled eggs are selected out of the 6 can be calculated as:

P(X) = (C(X,6) * C(9,6)) / C(18,6)

Where C(n,r) represents the combination of n things taken r at a time.

-5/11h=-5/9
Show your work please

Answers

-5/11h = -5/9..divide both sides by -5/11
h = (-5/9) / (-5/11)...when dividing with fractions, flip what u r dividing by, then multiply

h = -5/9 * - 11/5
h = 11/9 or 1 2/9 <=

Which property is shown in the following equation?

20 x 1 = 20

A. Zero property of multiplication

B. Identify property of multiplication

C. Negative one property of multiplication

D. Identify property of division

Answers

The answer for this question would be B) Identify property of multiplication or the second option because since the result 20 is the same as the 20 multiplied against 1. * I take no credit for the image below I just found it off google. ✅

Final answer:

The equation 20 x 1 = 20 demonstrates the Identity Property of Multiplication, which states that multiplying any number by one keeps its original value.

Explanation:

The property shown in the following equation 20 x 1 = 20 is the Identity Property of Multiplication. This property states that any number multiplied by one remains unchanged or that the number keeps its identity. The option B, Identify property of multiplication, is a typo, and it likely means to refer to the Identity Property of Multiplication. The options A, C, and D describe different properties that do not apply to this equation.

The Zero Property of Multiplication involves a multiplication where any number times zero is zero. The Negative One Property of Multiplication is not a standard mathematical property and seems to be a non-existent or misspelled option. The Identity Property of Division is not applicable as there is no division taking place in this equation.

During a certain week, a post office sold Rs.280 worth of 14-paisas stamps. How many of these stamps did they sell?

Answers

So basically ...

You convert the rupees in paisas. One rupee is equal to one hundred paisas, so ...

280 × 100 = 28,000

And then we divide,

28,000 ÷ 14 = 2000

The post office sold 2000 stamps!

Hope this helped! :)

The post office sold 2000.

To find out how many 14-paisa stamps the post office sold to make Rs.280, we need to follow a step-by-step solution.

Convert the total amount from rupees to paisas:Since the stamp's value is given in paisas.There are 100 paisas in 1 rupee.Rs.280 = 280 x 100 = 28000 paisas.The value of one stamp is 14 paisas.To find the number of stamps sold, we divide the total amount in paisas by the value of one stamp:

28000 paisas ÷ 14 paisas per stamp = 2000 stamps.

five quarts of latex enamel paint will cover about 100 square feet of wall surface. how many quart are needed to cover 71 square feet of kitchen wall and 69 square feet of bathroom wall ?

Answers

71 + 69 = 140.....so there is 140 sq ft to cover

100 / 5 = 140 / x....100 sq ft to 5 qts = 140 sq ft to x qts
cross multiply
(100)(x) = (140)(5)
100x = 700
x = 700/100
x = 7 qts <==== 7 qts will be needed

Is it linear or not, the height of a person and the persons age?

Answers

it is not linear because growth height varies with age
It's not because growth rates vary with age, gender also plays a role in the change

which of the following is not a example of a molecule

A H2s
B Mn
C KOH
D O3

Answers

The correct answer is D.
molecules refer to the smallest particle in a compound or an element, which possesses the chemical properties of that compound or element. They  are also made up of atoms which are held together by chemical bonds as result of exchange or sharing of electrons.
The Formula given in option D is an atom not a molecule because it is not sharing any bond with any other atom.
O3 is the correct answer :)!!

A person invests $4000 at 2% interest compounded annually for 4 years and then invests the balance (the $4000 plus the interest earned) in an account at 8% interest for 7 years. Find the value of the investment after 11 years.

(Hint: You need to break this up into two steps/calculations. Be sure to round your balance at the end of the first 4 years to the nearest penny so you can use it in the second set of calculations.)

Answers

[tex]\bf \qquad \textit{Compound Interest Earned Amount} \\\\ A=P\left(1+\frac{r}{n}\right)^{nt} \quad \begin{cases} A=\textit{accumulated amount}\\ P=\textit{original amount deposited}\to &\$4000\\ r=rate\to 2\%\to \frac{2}{100}\to &0.02\\ n= \begin{array}{llll} \textit{times it compounds per year}\\ \textit{annually, thus once} \end{array}\to &1\\ t=years\to &4 \end{cases} \\\\\\ A=4000\left(1+\frac{0.02}{1}\right)^{1\cdot 4}\implies A=4000(1.02)^4\implies A\approx 4329.73[/tex]

then she turns around and grabs those 4329.73 and put them in an account getting 8% APR I assume, so is annual compounding, for 7 years.

[tex]\bf \qquad \textit{Compound Interest Earned Amount} \\\\ A=P\left(1+\frac{r}{n}\right)^{nt} \quad \begin{cases} A=\textit{accumulated amount}\\ P=\textit{original amount deposited}\to &\$4329.73\\ r=rate\to 8\%\to \frac{8}{100}\to &0.08\\ n= \begin{array}{llll} \textit{times it compounds per year}\\ \textit{annually, thus once} \end{array}\to &1\\ t=years\to &7 \end{cases} \\\\\\ A=4329.73\left(1+\frac{0.08}{1}\right)^{1\cdot 7}\implies A=4329.73(1.08)^7\\\\\\ A\approx 7420.396[/tex]

add both amounts, and that's her investment for the 11 years.

Tony and his three friends live in Albuquerque, New Mexico, but they all attend college in Boston, Massachusetts. Because they want to have a car at school this year, they are planning to drive Tony's car from Albuquerque to Boston at the beginning of the school year. Although they'll each pay for their own food during the road trip, the friends plan to split the costs for gas and hotels evenly between the four of them.

Estimate the total cost that each friend will have to pay for gas and hotels. Explain how you got your answer. Here are some figures that may help you out:

Tony's car can travel 28 miles for each gallon of gas.
The average fuel cost at the time of their trip is $3 per gallon.
They plan to drive about 650 miles each day.
They estimate the average cost of a hotel each night is $85.
They will drive approximately 2,240 miles to get from Albuquerque to Boston.

Answers

Given

A road trip with these parameters

total distance 2240 midistance per day 650 micost per night for lodging $85mileage 28 mpggas price $3/galFind1/4 of the cost of gas and lodgingSolution

The cost of gas is ...

... (2240 mi)/(28 mi/gal)·($3/gal) = $240

The cost of lodging is

... ($85/day)·floor(2240 mi/(650 mi/day)) = $85·3 = $255

Total cost of gas and lodging is $240 +255 = $495.

The cost for a 1/4 share is $495/4 = $123.75.

If a cheetah can run 96.5 km/h, what is its speed in m/s?

Answers

Okay. So, 1,000 = 1 kilometer. To find the speed in meters, do 96.5 * 1,000. When you do that, you get 96,500 meters. The cheetah's speed is 96,500 meters per hour. But, it asks for the speed per second, so we're not done yet. 3,600 seconds equal 1 hour. Let's do 96,500/3,600. The quotient for that problem is 26.80555556 as shown on the calculator or 26.8 when rounded to the nearest tenth. The cheetah's speed in meters per second is 26.8.

Jade spend $37.60 on groceries. 4/5 of that total was spent on vegetables. How much was spent on other items

Answers

$7.52 was spent on the other items

divide the total spent by 5 to get what 1/5 is

37.60 / 5 = 7.52

 they spent $7.52 on other items

What is the prime factorization of 72?

Answers

Ik that 9 is one of em
Hope this helps have a nice nite
Hello!

72 is not a prime number, but your answer would be:
[tex] {2}^{3} \times {3}^{2} [/tex]

I really hope my answer benefites you! c:

Quadratic word problem:

A number minus 8 times its reciprocal equals 2. What is the number? (There may be more than one answer)

Answers

Final answer:

To solve the quadratic word problem, we set up the equation x - 8/x = 2 and simplify it to x^2 - 2x - 8 = 0. Using the quadratic formula, we find two possible values for x: -2 and 4.

Explanation:

To solve this quadratic word problem, we set up the equation: x - 8/x = 2. To simplify the equation, we multiply both sides by x to eliminate the denominator: x^2 - 8 = 2x. Rearranging the equation, we get x^2 - 2x - 8 = 0. To find the solutions, we can use the quadratic formula: x = (-b ± √(b^2 - 4ac)) / (2a). Substituting the values from our equation, we have x = (2 ± √(2^2 - 4(1)(-8))) / (2(1)). Solving the equation, we find two possible values for x: x = -2 or x = 4.

What is the value of n in the equation –(2n + 4) + 6 = –9 + 4(2n + 1)?

Answers

Answer:

5/2

Step-by-step explanation:

Start by eliminating parentheses.

... 2n +4 +6 = -9 +8n +4

... 10 = -5 +6n . . . . subtract 2n

... 15 = 6n . . . . . . . add 5

... 15/6 = n = 5/2

_____

Check

(2·5/2 +4) +6 = -9 +4(2·5/2 +1)

5 +4 +6 = -9 +4(5 +1)

15 = -9 +24 . . . . . true, so the answer checks OK

Answer:

THE ANSWER IS 1

Step-by-step explanation:


4^2-6(2^x)-16=0


solve for x

Answers

Assuming that   4^2-6(2^x)-16=0   is correct, we can rearrange it as:

-6(2^x) + 4^2 - 16=0

Are you sure it's not   6(2^x) + 4^2 - 16=0  ?

If   6(2^x) + 4^2 - 16=0    is correct, then

6(2^x) + 4^2 - 16=16 - 16 = 0, that is,   6(2^x) = 0.  Then x = 0 (answer)

The function ​s(x)equals=startfraction 3600 over 60 plus x endfraction equals 3600 left parenthesis 60 plus x right parenthesis superscript negative 1 3600 60+x=3600(60+x)−1 gives a​ person's average speed in miles per hour if he or she travels one mile in x seconds more or less than 60 seconds. use a linear approximation to s at 0 to find a​ person's approximate average speed if he or she travels one mile in 5656 seconds. what is his or her exact​ speed?

Answers

The exact average speed when x = 56 seconds is approximately 30.86 mph.

To use linear approximation to approximate a person's average speed if they travel one mile in 56 seconds, we'll first find the derivative of the function [tex]\( s(x) = \frac{3600}{60 + x} \)[/tex] with respect to x.

[tex]\[ s'(x) = -\frac{3600}{(60 + x)^2} \][/tex]

Now, we'll evaluate the derivative at x = 0 to find the slope of the tangent line at that point, which will be our linear approximation.

[tex]\[ s'(0) = -\frac{3600}{(60 + 0)^2} = -\frac{3600}{3600} = -1 \][/tex]

So, the slope of the tangent line at x = 0 is -1.

Now, using the point-slope form of the equation of a line, we'll find the equation of the tangent line at x = 0:

y - s(0) = s'(0)(x - 0)

[tex]\[ y - s(0) = -1 \cdot x \][/tex]

y = -x + s(0)

We know that s(0) is the exact speed at x = 0, so we'll substitute x = 0 into the original function to find it:

[tex]\[ s(0) = \frac{3600}{60 + 0} = 60 \text{ mph} \][/tex]

So, the equation of the tangent line is:

y = -x + 60

Now, to approximate the average speed when x = 56, we'll substitute x = 56 into the equation of the tangent line:

y = -56 + 60 = 4

So, the approximate average speed when x = 56 seconds is 4 mph.

To find the exact speed, we'll substitute x = 56 into the original function s(x):

[tex]\[ s(56) = \frac{3600}{60 + 56} = \frac{3600}{116} \approx 30.86 \text{ mph} \][/tex]

So, the exact average speed when x = 56 seconds is approximately 30.86 mph.

Calculate the second moment of area of a 4-in-diameter shaft about the x-x and yy axes, as shown.

Answers

Final answer:

To calculate the second moment of area for a 4-inch diameter shaft about the x-x and yy axes, we use the formula I = π * d^4 / 64 and find that I = 4 * π in´ for both axes.

Explanation:

The student is asking for the calculation of the second moment of area, also known as the moment of inertia, for a shaft with a 4-inch diameter about both the x-x and yy axes.

The moment of inertia of a circular cross-section about its centroidal axis is calculated using the formula I = π * d^4 / 64, where d is the diameter of the shaft. In this case, the diameter d is given as 4 inches.

To calculate the second moment of area for the 4-inch diameter shaft, we substitute the diameter into the formula to get:


I = π * (4 in)^4 / 64 = π * 256 in´ / 64 = 4 * π in´.


So, the moment of inertia for both the x-x and yy axes would be the same and equal to 4 * π in´, since the shaft is symmetrical about these axes.

5x - 3(1 + 2x) =24 - 4x

Answers

5x - 3(1 + 2x) = 24 - 4x

5x -3 - 6x = 24 - 4x

-x - 3 = 24 - 4x

3x = 27

3x/3 = 27/3

x = 9

hope this helps

Luke can paint 91 portraits in 7 weeks.
How many portraits can Luke paint in 4 weeks?

portraits

Answers

Hey!

91 ÷ 7 = 13

So, we know that Luke paints one portrait every week.

13 × 4 = 52

So, Luke paints 52 portraits in 4 weeks.
First, we can calculate the number if portraits he can paint in one week.
We can do this by simply dividing the total portraits by the weeks needed.

91 ÷ 7
=13

Now, to calculate the number of portraits he can paint in 4 weeks, just multiply the total number of paintings he can do in a week by 4.

13 x 4
=52
So the answer is 52 portraits.

Scott has 10 1/2 yd of fabric to make banners for the community fair. He needs 1 3/4 yd for each banner.

Answers

(10 1/2) / (1 3/4) =
10.50 / 1.75 =
6 <== he can make 6 banners

Answer:

6

Step-by-step explanation:

I took the k12 2.12 Quiz: Divide Fractions

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