Calculating Sample Size Summary

Calculating Sample Size

Summary

when working with confidence intervals for mean and proportion the margin of error (e) or level of accuracy is the distance between the sample mean or proportion in the middle of the interval and one of the ends of the interval.

the size of the sample can be fixed to reach the desired levels of accuracy.

Key Skills
  • calculate the sample size for required degrees of accuracy when estimating population means
  • calculate the sample size for required degrees of accuracy when estimating population proportion

Vocabulary

margin of error, confidence intervals, mean, standard deviation