(6 points) According to CBS News, 48% of Americans believe in ghosts. For the problems below, assume that is the actual population percentage. Suppose we choose a simple random sample of 72 Americans. For each problem, select the best response: (a) Suppose we wanted the standard deviation of the sample proportion to be half of what it is for a sample of size 72. To achieve this, we should take a sample of size A. 36 B. 288 C. 18 D. 144 (b) The sampling distribution of the proportion of those in the sample who believe in ghosts is approximately A. N(0.048, 0.0589) B. N(0.048,0.0035) C. N(0.48, 0.0589) D. N(0.48, 0.0035) (c) The probability of obtaining a sample proportion of 0.5 or higher is approximately