Question

The manager of the service department of a local car dealership has noted that the service...

The manager of the service department of a local car dealership has noted that the service times of a sample of 15 new automobiles have a sample variance of S2 = 16.

A 95% confidence interval estimate for the population variance of service times for all their new automobiles is:

A 95% confidence interval estimate for the population standard deviation of service times for all their new automobiles is:

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
The manager of the service department of a local car dealership has noted that the service...
The manager of the service department of a local car dealership has noted that the service times of a sample of 30 new automobiles has a standard deviation of 7 minutes. A 99% confidence interval estimate for the standard deviation of the service times for all their new automobiles is 16.047 to 45.722 4.778 to 8.066 22.93 to 96.31 27.1520 to 108.299
Exhibit 4 (Questions 19-22) The manager of the service department of a local car dealership has...
Exhibit 4 (Questions 19-22) The manager of the service department of a local car dealership has noted that the service times of a sample of 15 new automobiles has a sample standard deviation of S = 4 hours. We are interested to test the following hypotheses using α = 0.05 level of significance: H0 : σ2 ≤ 14 Ha : σ2 > 14 Refer to Exhibit 4. Assuming that the population of service times follows an approximately normal distribution, what...
Exhibit 4 The manager of the service department of a local car dealership has noted that...
Exhibit 4 The manager of the service department of a local car dealership has noted that the service times of a sample of 15 new automobiles has a sample standard deviation of S = 4 hours. We are interested to test the following hypotheses using α = 0.05 level of significance:                                               H0 : σ2 ≤ 14                                               Ha : σ2 > 14 a. Refer to Exhibit 4. Assuming that the population of service times follows an approximately normal distribution, what is...
Repair time (X) for an oil change at a car dealership has a population mean of...
Repair time (X) for an oil change at a car dealership has a population mean of 50 min and a population standard deviation of 7 min. Questions A and B must be done using a pencil and paper. a.) If a random sample of 50 oil changes is selected. Set up a 99% confidence interval estimate for an oil change. b.) If a random sample of 75 oil changes is selected. Set up a 95% confidence interval estimate for an...
The service department at a new car dealer checks for small dents in cars brought in...
The service department at a new car dealer checks for small dents in cars brought in for scheduled maintenance. It finds that 31 of 96 randomly-sampled cars have a dent that can be removed easily. The service department wants to estimate the percentage of all cars with these easily repaired dents. Check the conditions, construct a plus-four confidence interval to estimate the percentage with 99% confidence, and write it in a complete sentence related to the scenario.
A department store manager wants to estimate with a 99% confidence interval the mean amount spent...
A department store manager wants to estimate with a 99% confidence interval the mean amount spent by all customers at the store. How large of a sample should be taken if the manager is willing to tolerate an error of $3. Assume the population standard deviation is $31.
A manager wishes to estimate a population mean using a 95​% confidence interval estimate that has...
A manager wishes to estimate a population mean using a 95​% confidence interval estimate that has a margin of error of ±44.0 If the population standard deviation is thought to be 610​, what is the required sample​ size?
The quality control manager at a light-bulb factory needs to estimate the mean life of a...
The quality control manager at a light-bulb factory needs to estimate the mean life of a new type of light-bulb. The population standard deviation is assumed to be 65 hours. A random sample of 40 light-bulbs shows a sample mean life of 505 hours. Construct and explain a 95% confidence interval estimate of the population mean life of the new light-bulb. what size sample would be needed to achieve a margin of error of 15 hours or less?
The owner of a large car dealership believes that the financial crisis decreased the number of...
The owner of a large car dealership believes that the financial crisis decreased the number of customers visiting her dealership. The dealership has historically had 800 customers per day. The owner takes a sample of 100 days and finds the average number of customers visiting the dealership per day was 750. Assume that the population standard deviation is 350. Use a 5% significance level. Perform a hypothesis test to determine whether there has been a decrease in the average number...
A sample of 20 items provides a sample standard deviation of 5.                                
A sample of 20 items provides a sample standard deviation of 5.                                                                                      a. Compute the 90% confidence interval estimate of the population variance.                                                                                        b. Compute the 95% confidence interval estimate of the population variance.                                                                         c. Compute the 95% confidence interval estimate of the population variance.
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT