# Standard Error Calculation

1. The mean television viewing time for teens is 3 hours per day. Assume the population mean is 3 and the population standard deviation is known to be 1.2 hours. Suppose a sample of 50 teens will be used to monitor television viewing time.

a) What is the standard error of the sampling mean?

b) What is the probability the sampling mean will be within +/- 0.25 hours of the population mean?

https://brainmass.com/statistics/standard-error/standard-error-calculation-346100

#### Solution Summary

This problem demonstrates how to calculate a standard error and how to determine probabilities using z-scores.

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