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# The primary purpose of a confidence interval is to take data from a sample to estimate A) a sample statistic. B) the distribution of sample...

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The primary purpose of a confidence interval is to take data from a sample to estimate A) a sample statistic. B) the distribution of sample statistics. C) a population parameter. Review 2. According to one article, the average American drinks 1.54 cups of coffee per day. In Spring 2016 data concerning coffee consumption were collected from a random sample of 523 World Campus students. A 95% confidence interval for the mean cups of coffee consumed per day was computed to be [1.07229, 1.34454]. Is there evidence that the mean coffee consumption in World Campus students is less than the national average of 1.54 cups of coffee per day? A) Yes, there is evidence that the mean coffee consumption in World Campus students is less than the national average of 1.54 cups of coffee per day. B) No, there is not evidence that the mean coffee consumption in World Campus students is less than the national average of 1.54 cups of coffee per day. Review 3. Which of the following statements is correct about a parameter and a statistic associated with repeated random samples of the same size from one population? A) Values of the parameter will vary from sample to sample but values of a statistic will not. B) Values of both a parameter and a statistic may vary from sample to sample. C) Values of a parameter will vary according to the sampling distribution for that parameter. D) Values of a statistic will vary according to the sampling distribution for that parameter. Review 4. Suppose that length of hospital stays are independent and normally distributed with an average
stay of 6.3 days and standard deviation of 2.5 days. What is the standard deviation of the distribution of sample means (i.e., standard error) for random samples of n = 100 patients? A) 0.630 days B) 0.025 days C) 0.063 days D) 0.250 days Review 5. In Spring 2016 a sample of 233 male World Campus students was asked how many hours per week they exercise. In that sample of n=233, the mean was 4.979 hours per week with a standard deviation of 4.867 hours per week. According to Minitab Express, the standard error of the mean is 0.319. Which of the following interpretations of that standard error is correct? A) In the population of all male World Campus students, the standard deviation of the number of hours exercised is 0.319 B) In this sample of n=233 male World Campus students, the standard deviation of the number of hours exercised is 0.319 C) If we were to repeatedly pull samples of n=233 from the population of all male World Campus students and record each sample's mean, the distribution of those sample means would have a standard deviation of 0.319 Review 6. In Spring 2016 data were collected from a sample of 522 World Campus students. In that sample, the proportion who said that they were currently dieting was .341 What is the margin of error that would be used to construct a 95% confidence interval for the proportion of all World Campus students who are currently dieting? Hint: For a 95% confidence interval for a proportion, z* = 1.96 A) .0004 B) .0207 C) .0407
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The primary purpose of a confidence interval is to take data from a sample to estimate A) a sample statistic.
B) the distribution of sample statistics.
C) a population parameter. Review 2....

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