Do This: 1. If n = 50; = 0.5; and X = 18, find a. the best point estimate of the population mean b. the 95% confidence interval of the population mean DVANT Do This: 2. Forty graduating students were given the following grades in a field study. Assume that they come from a population that has the shape of a normal distribution and = 6. Estimate their thre grades using 99% confidence 92 84 93 90 92 93 94 90 90 94 87 83 95 85 87 85 95 84 89 91. 89 93 87 83 87 80 90 84 83 82 80 90 83 80 89 88 81 81 93 90 DEVANT