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# Choosing Sample Size

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Choosing an appropriate sample size
A consumer advocacy group is doing a large study on car rental practices. Among other things, the consumer group would like to estimate the mean monthly mileage, u , of cars rented in the U.S. over the past year. The consumer group plans to choose a random sample of monthly U.S. rental car mileages and then estimate u using the mean of the sample.

Using the value 700 miles per month as the standard deviation of monthly U.S. rental car mileages from the past year, what is the minimum sample size needed in order for the consumer group to be 99% confident that its estimate is within 135 miles per month of u ?

https://brainmass.com/statistics/sample-size-determination/choosing-sample-size-227745

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The answer is in the attached file
Choosing an appropriate sample size
A consumer advocacy group is doing a large study on car rental practices. Among other things, the consumer group would like to estimate the mean monthly mileage, u , of cars rented in the U.S. over the past year. The consumer group plans to choose a ...

#### Solution Summary

Calculates the Sample Size for 99% confidence.

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