1. The meantelevision viewing time for teens is 3 hours per day. Assume the population mean is 3 and the population standard deviationis 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 errorof the samplingmean?
b) What is the probabilitythe sampling mean will be within +/- 0.25 hours of the population mean?
This problem demonstrates how to calculate a standard error and how to determine probabilities using z-scores.