Explain the reasoning behind the following statement: “In studies about a very diverse population, large samples are often necessary, whereas for more homogeneous populations smaller samples are often adequate.” Illustrate for the problem of estimating mean income for all medical doctors in the United States compared to estimating mean income for all entry-level employees at McDonald’s restaurants in the United States.
Answer to relevant QuestionsYou randomly sample five students at your school to estimate the proportion of students who like tofu. All five students say they like it. a. Find the sample proportion who like it. b. Find the standard error. Does its usual ...We want a 95% confidence interval for the population proportion of students in a high school in Dallas, Texas, who can correctly find Iraq on an unlabeled globe. For a random sample of size 50, 10 get the correct answer. a. ...When a GSS asked 1326 subjects, “Do you believe in heaven?” (coded HEAVEN), the proportion who answered yes was 0.85. From results in the next section, the estimated standard deviation of this point estimate is 0.01. a. ...In a recent GSS, the responses about the number of hours daily spent watching TV for the five subjects who identified themselves as Buddhists were 0, 5, 0, 1, 2. a. Find the mean, standard deviation, and standard error. b. ...For eBay auctions of the iPad2 64GB 3G Wi-Fi units, a sample was taken in July 2011 where the Buy-it-Now prices were (in dollars): 1388, 1199, 1100, 1099, 1088, 1049, 1026, 999, 998, 978, 949, 930 a. Explain what a parameter ...
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