Question: In a sample of 60 electric motors, the average efficiency (in percent) was 85 and the standard deviation was 2. a. Find a 95% confidence

In a sample of 60 electric motors, the average efficiency (in percent) was 85 and the standard deviation was 2.

a. Find a 95% confidence interval for the mean efficiency.

b. Find a 99.5% confidence interval for the mean efficiency.

c. What is the confidence level of the interval

(84.63, 85.37)?

d. How many motors must be sampled so that a 95%

confidence interval specifies the mean to within

±0.35?

e. How many motors must be sampled so that a 99.5% confidence interval specifies the mean to within ±0.35?

Step by Step Solution

There are 3 Steps involved in it

1 Expert Approved Answer
Step: 1 Unlock blur-text-image
Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock
Step: 3 Unlock

Students Have Also Explored These Related Statistical Sampling To Auditing Questions!

Q:

Deena overhears someone criticizing her for talking too much in class. Deena is mean at first, but then thinks more deeply about why that person said that. Deena concludes that she could talk a...

Q:

In a sample of 60 electric motors, the average efficiency (in percent) was 85 and the standard deviation was 2. a. Find a 95% confidence interval for the mean efficiency. b. Find a 99.5% confidence...

Q:

Refer to Exercise 8. a. Find a 98\% lower confidence bound for the mean efficiency. b. The claim is made that the mean efficiency is greater than \(84.6 \%\). With what level of confidence can this...

Q:

In a sample of 60.0 electric motors, the average efficiency (in percent) was 85 and the standard deviation was 2. 1) Find a 98% lower confidence bound for the mean efficiency. (Round the final answer...

Q:

Required information In a sample of 5 5 electric motors, the average efficiency ( in percent ) was 8 5 and the standard deviation was 2 . What is the confidence level of the interval ( 8 4 . 6 1 4 4...

Q:

!Required informationIn a sample of 65.0 electric motors, the average efficiency (in percent) was 85. Assume the population standard deviation is 2.What is the confidence level of the interval...

Q:

Please help answer second part You want to estimate the mean weight of quarters in circulation. A sample of 60 quarters has a mean weight of 5.641 grams and a standard deviation of 0.062 gram. Use a...

Q:

0 ework.aspx?homeworkld=621246430&questionld=19&flushed=false&cld=... 2 X # Dest MAT232: Statistical Literacy (GSR2206B) April Young 03/12/22 12:40 PM Homework: Week 5 - Assignment Question 19,...

Q:

You want to estimate the mean weight of quarters in circulation. A sample of 60 quarters has a mean weight of 5.651 grams and a standard deviation of 0.055 gram. Use a single value to estimate the...

Q:

Explainthese attachments. Question 1 (total 15 points). A firm has a production function:f (K, Z) = 50LK05 + L2 K2 - 13 K3 a. What is its short-run production function if capital is fixed at K=4? b....

Q:

You want to estimate the mean weight of quarters in circulation. A sample of 60 quarters has a mean weight of 5.669 grams and a standard deviation of 0.056 gram. Use a single value to estimate the...

Q:

What is the difference between stand-alone risk and market risk? How are they measured?

Q:

Define the following pricing techniques: Odd pricing Price lining Leader pricing

Q:

4. (True/False): The Str_copy procedure prevents a string from being copied into too small a memory area.

Q:

For a site chosen at random, estimate the following probabilities. (a) P(0 x