Suppose 20 independent hypothesis tests are done, each using a = .05. If Ho is actually true for all 20 of them, what is the probability that at least one of them will incorrectly reject Ho?

In a recent Super Bowl, a TV network predicted that 48 % of the audience would express an interest in seeing one of its forthcoming television shows. The network ran commercials for these shows during the Super Bowl. The day after the Super Bowl, and Advertising Group sampled 103 people who saw the commercials and found that 46 of them said they would watch one of the television shows. Suppose you are have the following null and alternative hypotheses for a test you are running: Но: р 3 0.48 Ha:p + 0.48 (a) Calculate the sample test statistic: (b) Calculate the standardarized test statistic (the z-score). Check Answer M

Suppose a group of 900900 smokers (who all wanted to give up smoking) were randomly assigned to receive an antidepressant drug or a placebo for six weeks. Of the 356356 patients who received the antidepressant drug, 113113 were not smoking one year later. Of the 544544 patients who received the placebo, 203203 were not smoking one year later. Given the null hypothesis ?0:(?1−?2)=0H0:(p1−p2)=0 and the alternative hypothesis ??:(?1−?2)≠0H, conduct a test to see if taking an antidepressant drug can help smokers stop smoking. Use ?=0.01(a)    The rejection region is |?|>(b)    The test statistic is ?=zThe final conclustion is

chapter 11