3.28 chickenpox, part ii. we learned in exercise 3.26 that about 90% of american adults had chickenpox before adulthood. we now consider a random sample of 120 american adults. (a) how many people in this sample would you expect to have had chickenpox in their childhood? and with what standard deviation? (b) would you be surprised if there were 105 people who have had chickenpox in their childhood? (c) what is the probability that 105 or fewer people in this sample have had chickenpox in their childhood? how does this probability relate to your answer to part (b)?

The vice president of programming at nbc is finalizing the prime-time schedule for the fall. she has decided to include a hospital drama but is unsure which of two possibilities to select. she has a pilot called the surgeon and another called critical care. to her make a final decision, a sample of 20 viewers from throughout the united states was asked to watch the two pilots and indicate which show they prefer. the results were that 12 liked the surgeon, 7 liked critical care, and one had no preference. state the decision rule, using the 0.10 significance level. h0: π = 0.50 h1: π ≠ 0.50 1. reject h0 if number of + signs is either < = or > = 2. what is your decision regarding h0? is there a preference for one of the two shows?