# 11: Sample Size to Estimate a Population Mean

Sample Size to Estimate a Population Mean

This calculator calculates the sample size needed to estimate a population mean. Please report the error to Dr. Jessica Kuang at jkuangATvcccd.edu.

To learn how to use this calculator, please watch a short video here.

Input

Fill in the population standard deviation ($$\sigma$$), the error bound (E), and the confidence level (CL).  Write the confidence level as a decimal.  For example, for a 95% confidence level, enter 0.95  for CL.  Then hit Calculate and assuming the population is normally distributed, the necessary sample size will be shown.

 Standard Deviation ($$\sigma$$): Error Bound (E): Confidence Level (enter a decimal):

Output

 Sample Size (n):