5 ± $39.53 b. $127.95 ± $7.45 c. $127.95 ± $4.87 d. $127.95 ± $6.25 e. $127.95 ± $30.81
5 ± $39.53 b. $127.95 ± $7.45 c. $127.95 ± $4.87 d. $127.95 ± $6.25 e. $127.95 ± $30.81
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Question
A random sample of 40 customers at Redners finds an average spending amount of $127.95 and a standard deviation of $24.03. Which of the following is an approximate 90% confidence interval for the average spending amount of all customers at Redners?
- a. $127.95 ± $39.53
- b. $127.95 ± $7.45
- c. $127.95 ± $4.87
- d. $127.95 ± $6.25
- e. $127.95 ± $30.81
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