Suppose that prior to conducting a coin-flipping experiment, we suspect that the coin is fair. How many times would we have to flip the coin in order to obtain a 99% confidence interval of width of at most .18 for the probability of flipping a head? a) 205 b) 167 c) 210 d) 166 e) 204

It has been observed that some persons who suffer colitis are diagnosed with it again within one year of the first episode. This is due, in part, to damage from the first episode. In order to examine the percentage of the persons who suffer colitis a second time, a random sample of 1000 people who suffered colitis was collected. It was observed that 15 of them again suffered colitis within one year. Select a 95% confidence interval for the true proportion of those who suffer a second episode. a) [0.0115, 0.0525] b) [0.00946, 0.0525] c) [0.00846, 0.0725] d) [0.00846, 0.0425] e) [0.00746, 0.0225] f) None of the above