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Question: Gastwirth (1988, p. 507) describes a court case in which Bristol-Myers was ordered by the Federal Trade Commission to stop advertising that "twice as many dentists use Ipana [toothpaste] as any other dentifrice" and that more dentists recommended it than any other dentifrice. Bristol-Myers had based its claim on a survey of 10,000 randomly selected dentists from a list of 66,000 subscribers to two dental magazines. They received 1983 responses, with 621 saying they used Ipana and only 258 reporting that they used the second most popular brand. As for the recommendations, 461 respondents recommended Ipana, compared with 195 for the second most popular choice.
a. Specify the sampling frame for this survey, and explain whether you think "using the wrong sampling frame" was a difficulty here, based on what Bristol-Myers was trying to conclude.
b. Of the remaining four "difficulties and disasters in sampling" (other than "using the wrong sampling frame"), which do you think was the most serious in this case? Explain.
c. What could Bristol-Myers have done to improve the validity of the results after it had mailed the 10,000 surveys and received 1983 back? Assume the company kept track of who had responded and who had not.
Find the proportion of men who died from cardiovascular disease in the high-blood-pressure group. Then calculate the odds.
Determine the 95 percent confidence interval and the 95 percent prediction interval for the selling price of a home with 2,200 square feet.
Assume for this part that the test results are conditionally independent given Fred's disease status. Let a = P(Tj|D) and b = P(Tj|Dc).
To obtain a 95% interval estimate for the mean student commuting time to the IUPUI campus with a margin of sampling error of MOE = 2 minutes, the minimum sample size should be n = _____. A pilot sample of students provided a planning value of σ^ =..
37 percent of managers have MBA degrees. Using probability formulas. Determine the proportion of employees who are managers and have MBA degrees.
Use the two lists of valid syllogistic forms to determine whether each is valid from the Boolean standpoint, valid from the Aristotelian standpoint, or invalid.
The data for each of the following variables includes one or more outliers. In each case, identify the outlier(s).
1. in a well known quiz show the contestant is asked to choose between door number 1 door number 2 and door
When variables are used as the basis for a contingency table, what scale of measurement must they represent?
Cary Oakey computes the 95% confidence interval for the average time on the site as 4.2 ± 1.984(2.5/101). What is his mistake
The average number of miles that 90 truckers drove in a day was 540.0 with a standard deviation of 40 miles. What is the 99% confidence interval of the true mean number of miles driven by all truckers?
According to the UK All Green and Bowling Association, male retirees spend an average of 15 hours of bowling per week. Suppose you are given a sample of 100 male retirees and that the population variance is 25. What is the population standard devi..
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