13.56 A pharmaceutical company has specified that the variation in the quantity of active ingredient in its leading prescription medication must be such that the population standard deviation must be no more than 1.20 micrograms. The ingredient content of the pills is normally distributed. In a random sample of 20 pills, the standard deviation is found to be s 5 1.32 micrograms.

Based on the sample data, use the  5 0.05 level in testing H0:  # 1.20 micrograms versus H1:  . 1.20 micrograms.