# The biweekly salary of on-campus jobs has a standard deviation of $5. What sample size is...

## Question:

The biweekly salary of on-campus jobs has a standard deviation of $5.

What sample size is required to be at least 95% confident that the mean biweekly income is within a sampling error of $0.75? (round sample size to whole number).

## Sample Size:

The sample size needed for a study depends on the precision we require. There are three key items for calculating the sample size for estimating a population mean: 1) the margin of error, 2) the standard deviation, 3) and the confidence level.

## Answer and Explanation:

The sample size needed is of n= 171

How do we choose the sample size for estimating the population mean? We just need to apply the formula taking...

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#### Learn more about this topic:

from Statistics 101: Principles of Statistics

Chapter 9 / Lesson 4