To properly treat patients, drugs prescribed by physicians must not only have a mean potency value as specied on the drug's container, but also the variation in potency values must be small. Otherwise, pharmacists would be distributing drug prescriptions that could be harmfully potent or have a low potency and be ineffective. A drug manufacturer claims that his drug has a potency of 5 i 0.1 milligram per cubic centimeter {mgfcc). A random sample of four containers gave potency readings equal to 4.94, 5.10, 5.02, and 4.90 mgg'cc. (a) Do the data present sufcient evidence to indicate that the mean potency differs from 5 mgfcc? (Use a = 0.05.) State the null and alternative hypotheses. O HO\"; 0.0011 versus Ha: 02 0.0011 0 H0: 0'2 = 0.0011 versus Ha: 02 E x2