Question 9Your answer is CORRECT.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 89% confidence interval of widthof at most .12 for the probability of flipping a head? a) 178b) 104c) 105d) 177e) 180f) None of the above

Question 10Your answer is CORRECT.

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.

Question 11Your answer is CORRECT.When solving for the sample size required to estimate pto within a particular margin of error, under what circumstances do we use p̂= .5?

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Question 12Your answer is CORRECT.Television viewers often express doubts about the validity of certain commercials. In an attempt to answer their critics, a large advertiser wants to estimate the true proportion of consumers who believe what is shown in commercials. Preliminary studies indicate that about 40% of those surveyed believe what is shown in commercials. What is the minimum number of consumers that should be sampled by the advertiser to be 99%