sample of N = 5 individuals is selected from a population with a mean of 74. A treatment is administered to the individuals in the sample and, after treatment, the sample has a mean of X = 65.6 and SS = 71.2. (a) Compute a 95% confidence interval for , the population mean for the treatment (b) Perform a hypothesis test to decide whether the population mean of the treatment group is significantly larger than the mean of the general population