Question

3. Applying the central limit theorem Suppose you are a television network executive interested in how a new pilot show, Statistics, will be received by the general U.S. television-viewing population. You hire several market research firms; each recruits a random sample of television viewers and asks them to watch the pilot of Statistics. Each firm then gathers 25 respondents and asks each of them, "On a scale of 1 to 10, where 1 means you'll never watch Statistics again, and 10 means you expect to never miss an episode of Statistics, how do you rate Statistics?" Assume that if you asked every member of the general U.S. television-viewing population about the pilot, the mean response would be 4.0 with a standard deviation of 1.2. Each market research firm reports the mean rating of its random sample. Assume each market research firm recruits a different sample, and that you hired exactly enough market research firms such that all possible samples of 25 U.S. television viewers were sampled and their mean ratings reported. Which of the following are true about the sampling distribution of the mean ratings reported to you by the market research firms? Check all that apply. O The shape of the distribution of mean ratings is approximately normal. O The standard deviation of the distribution of mean ratings is 0.24. O The mean of the distribution of mean ratings is 0.16. O The shape of the distribution of mean ratings depends on the shape of the ratings of the general U.S. television-viewing population. If you were really a television network executive, you would not hire multiple market research firms to each recruit a different sample of respondents. Instead, you would likely hire only one market research firm. If this is the case, why should you care about the theoretical distribution of mean ratings of multiple samples if you are only going to hire one firm and get one sample and one mean from that sample? O You should not care about the possible distribution of mean ratings. You should only care about the mean and perhaps the highest and lowest ratings. O To draw conclusions about the population mean using a sample mean, you need to know the theoretical distribution of the possible values the sample mean ratings could have. O You need to know the theoretical distribution of possible values of the sample mean ratings to know whether the market research firm recruited the right sample.

Answer 1

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