Question 9 your answer is incorrect suppose that

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Question 9 Your answer is INCORRECT. 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 width of at most .12 for the probability of flipping a head? a) 178 b) 104 c) 105 d) 177 e) 180 f) None of the above
Question 10 Your answer is CORRECT.
11/19/2019 Print Test 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 900 people who suffered colitis was collected. It was observed that 17 of them again suffered colitis within one year. Select a 90% confidence interval for the true proportion of those who suffer a second episode.
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Question 11 Your answer is CORRECT. When solving for the sample size required to estimate p to within a particular margin of error, under what circumstances do we use p̂ = .5? .
Question 12 Your 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% confident that their estimate will fall within 1% of the true population proportion?
11/19/2019

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