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# Assume that all variable are approximately | Ch 7.2 - 15E ISBN: 9780073534985 75

## Solution for problem 15E Chapter 7.2

Elementary Statistics: A Step By Step Approach | 9th Edition

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Problem 15E

Assume that all variable are approximately normally distributed.

Chicago Commuters A sample of 14 commuters in Chicago showed the average of the commuting times was 33.2 minutes. If the standard deviation was 8.3 minutes, find the 95% confidence interval of the true mean.

Source: U. S. Census Bureau.

Step-by-Step Solution:

Step 1 of 2:

It is given that 33.2 minutes is the mean commuting time of a sample of 14 commuters and 8.3 minutes is the standard deviation.

Using this we need to find the 95% confidence interval for mean.

Step 2 of 2

##### ISBN: 9780073534985

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