Estimates and Sample Sizes

User Generated

qzzwj01

Mathematics

Description

This chapter provides you with important concepts for estimating an interval that will contain the true population mean, population proportion and population variance.

Unformatted Attachment Preview

Name:______________________________________ Module 2 Homework Assignment 1.) 459 randomly selected light bulbs were tested in a laboratory, 291 lasted more than 500 hours. Find a point estimate of the true proportion of all light bulbs that last more than 500 hours. Solution: 2.) Instructor Comments: Find the critical value for zα/2 that corresponds to a degree of confidence of 98%. Solution: Instructor Comments: 3.) Find the critical value for tα/2 corresponding to n = 12 and 95% confidence level. Solution: Instructor Comments: 4.) Use the confidence level and sample data to find the margin of error E. College students’ annual earnings: 99% confidence, n = 74, x = $3967, s = $874 Solution: Instructor Comments: 5.) Construct the confidence interval for question 4 above. Solution: Instructor Comments: 6.) Write a statement that correctly interprets the confidence interval found in question 5. Solution: Instructor Comments: 7.) Find the critical value  L2 corresponding to a sample size of 19 and a confidence level of 99% if the test is two-tailed. Solution: Instructor Comments: Find the critical value  R2 corresponding to a sample size of 19 and a confidence level of 99% if 8.) the test is two-tailed. Solution: Instructor Comments: 9.) The values listed below are the waiting times (in minutes) of customers at the Bank of Providence, where customers enter any one of three different lines that have formed at three teller windows. Construct a 95% confidence interval for the population standard deviation  and write a statement that correctly interprets the results. 4.2 Solution: 5.4 5.8 6.2 6.7 7.7 8.5 9.3 10.0 Instructor Comments: 10.) You want to estimate  for the population of waiting times at a fast-food restaurant’s drive-up windows, and you want to be 95% confident that the sample standard deviation is within 20% of . Find the minimum sample size needed. Is this sample size practical? Solution: Instructor Comments:
Purchase answer to see full attachment
User generated content is uploaded by users for the purposes of learning and should be used following Studypool's honor code & terms of service.

Explanation & Answer

Please let me know if there is anything needs to be changed or added. I will be also appreciated that you can let me know if there is any problem or you have not received the work. Please let me know if there is anything needs to be changed or added. I will be also appreciated that you can let me know if there is any problem or you have not received the work Good luck in your study and if you need any further help in your assignments, please let me know Can you please confirm if you have received the work? Once again, thanks for allowing me to help you R Probability MESSAGE TO STUDYPOOL NO OUTLINE IS NEEDED

Name:______________________________________

Module 2 Homework Assignment
1.) 459 randomly selected light bulbs were tested in a laboratory, 291 lasted more than 500 hours.
Find a point estimate of the true proportion of all light bulbs that last more than 500 hours.
Solution:
N = 459
Success = 291
Proportion = 291/459 = 0.6340

2.)

Instruc...


Anonymous
Just what I needed. Studypool is a lifesaver!

Studypool
4.7
Trustpilot
4.5
Sitejabber
4.4

Related Tags