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Homework answers / question archive / Results for this submission Entered Answer Preview Result Message 1

Results for this submission Entered Answer Preview Result Message 1

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Results for this submission Entered Answer Preview Result Message 1.96 1.96 correct 1.04 1.04 incorrect You are close. It is possible that you need to round to more decimal places. 1.28 1.28 incorrect You are close. It is possible that you need to round to more decimal places. 2.06 2.06 incorrect You are close. It is possible that you need to round to more decimal places. 2.58 2.58 incorrect You are close. It is possible that you need to round to more decimal places. 1.75 1.75 incorrect You are close. It is possible that you need to round to more decimal places. At least one of the answers above is NOT correct. (1 point) Find the critical z-score value for each of the following confidence levels. Give each answer to at least three decimal places. The z-critical value for a 95% confidence level is: 1.96 The z-critical value for a 70% confidence level is: 1.04 The z-critical value for an 80% confidence level is: 1.28 The z-critical value for a 96% confidence level is: 2.06 . The z-critical value for a 99% confidence level is: 2.58 . The z-critical value for a 92% confidence level is: 1.75

(1 point) A large retail store wants to estimate the average amount of time ([4) its customers wait in line during checkout. In a simple random sample of 38 customers, the average wait time was 242.9 seconds. The wait times in the sample had a standard deviation of 41 .05 seconds. In each question below, give answers to at least three decimal places. a. Find a 90% confidence interval for [4, using the above sample data: 231.946 l < ,4 < 253.854 1 b. Find a 95% confidence interval for [4, using the above sample data: 229.848 . i < [4 < 255.952 HH c. Find a 99% confidence interval for u, using the above sample data: 225.746 > l<u< 260.054 5 i H

(1 point) In a sample of 11 textbooks from lower-level mathematics courses, the cost of a hardcover printed version has a mean of $197.00 and a (sample) standard deviation of $11.95. Use this sample data to find a 96% con?dence interval for the mean cost of hardcover printed textbooks from all lower-level mathematics courses. Round all answers to the nearest cent (two decimal places). a. The margin of error for this confidence interval is: $ Cl: b. The confidence interval is $ | E! l < [4 < $ iii

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