In order to fairly set the flat rates for auto mechanics, a shop foreman needs to estimate average time it takes to replace a fuel pump in a car. How large the sample must be sele if he wants to be 95 % confident that the average time is within 15 minutes of the samp average. Assume that the sample standard deviation of all times is 34 minutes
In order to fairly set the flat rates for auto mechanics, a shop foreman needs to estimate average time it takes to replace a fuel pump in a car. How large the sample must be sele if he wants to be 95 % confident that the average time is within 15 minutes of the samp average. Assume that the sample standard deviation of all times is 34 minutes
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.5: Comparing Sets Of Data
Problem 14PPS
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