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a) What is the confidence interval? A survey of 25 randomly selected customers found the ages shown (in years). The mean is 32.24 years and the standard deviation is 8.80 years. a) Construct a 90% confidence interval for the mean age of all customers, assuming that the assumptions and conditions for the confidence interval have been met b) How large is the margin of error? c) How would the confidence interval change if you had assumed that the population standard deviation was known to be 9.0 years? (Round to two decimal places as needed.) b) What is the margin of error? The margin of error is (Round to two decimal places as needed.) Question 19 of 20 This test: 61 This questi is wider than the interval from part a. ) is narrower than the interval from part a. c) What is the confidence interval using the given population standard deviation? Select the correct choice below and fill in the answer boxes within your choice. (Round to two decimal places as needed.) OA. The new confidence interval ( OB. The new confidence interval (

a) What is the confidence interval? A survey of 25 randomly selected customers found the ages shown (in years). The mean is 32.24 years and the standard deviation is 8.80 years. a) Construct a 90% confidence interval for the mean age of all customers, assuming that the assumptions and conditions for the confidence interval have been met b) How large is the margin of error? c) How would the confidence interval change if you had assumed that the population standard deviation was known to be 9.0 years? (Round to two decimal places as needed.) b) What is the margin of error? The margin of error is (Round to two decimal places as needed.) Question 19 of 20 This test: 61 This questi is wider than the interval from part a. ) is narrower than the interval from part a. c) What is the confidence interval using the given population standard deviation? Select the correct choice below and fill in the answer boxes within your choice. (Round to two decimal places as needed.) OA. The new confidence interval ( OB. The new confidence interval (

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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062 91 07 07 68 48 25 30 30 23 34 38 20 48 45 ZE 9E ZE ZZ 62 18 31 34 27 40
Transcribed Image Text:062 91 07 07 68 48 25 30 30 23 34 38 20 48 45 ZE 9E ZE ZZ 62 18 31 34 27 40
a) What is the confidence interval? A survey of 25 randomly selected customers found the ages shown (in years). The mean is 32.24 years and the standard deviation is 8.80 years. a) Construct a 90% confidence interval for the mean age of all customers, assuming that the assumptions and conditions for the confidence interval have been met b) How large is the margin of error? c) How would the confidence interval change if you had assumed that the population standard deviation was known to be 9.0 years? (Round to two decimal places as needed.) b) What is the margin of error? The margin of error is (Round to two decimal places as needed.) Question 19 of 20 is wider than the interval from part a. ) is narrower than the interval from part a. This test: 61 This questi ← c) What is the confidence interval using the given population standard deviation? Select the correct choice below and fill in the answer boxes within your choice. (Round to two decimal places as needed.) OA. The new confidence interval ( OB. The new confidence interval (
Transcribed Image Text:a) What is the confidence interval? A survey of 25 randomly selected customers found the ages shown (in years). The mean is 32.24 years and the standard deviation is 8.80 years. a) Construct a 90% confidence interval for the mean age of all customers, assuming that the assumptions and conditions for the confidence interval have been met b) How large is the margin of error? c) How would the confidence interval change if you had assumed that the population standard deviation was known to be 9.0 years? (Round to two decimal places as needed.) b) What is the margin of error? The margin of error is (Round to two decimal places as needed.) Question 19 of 20 is wider than the interval from part a. ) is narrower than the interval from part a. This test: 61 This questi ← c) What is the confidence interval using the given population standard deviation? Select the correct choice below and fill in the answer boxes within your choice. (Round to two decimal places as needed.) OA. The new confidence interval ( OB. The new confidence interval (
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