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A random sample of 100 foxes was examined by a team of veterinarians to determine the prevalence of a particular type of parasite. Counting the number of parasites per fox, the veterinarians found that 65 foxes had no parasites, 20 had one parasite, and so on. A frequency tabulation of the data is given here:
Number of Parasites, x 0 1 2 3 4 5 6 7 8
Number of Foxes, f 65 20 7 3 1 2 1 0 1
(1) Calculate the sample mean for the sample.
(2) Calculate the sample variance for the following sample (advanced level question).
A study of the scores on an in-plant course in management principles and the years of service of the employees enrolled in the course yielded the following statistics.
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To test the null hypothesis that the mean waist size for males under 40 years equals 34 inches versus the hypothesis that the mean differs from 34, the following data were collected: 33, 33, 30, 34, 40, 35, 35, 32, 32, 34, 36, 30 calculate the T-v..
A survey on the drinking habits of Americans estimated the percentage of adults across the country who drink beer, wine, or hard liquor at least occasionally. Of the 1516 adults interviewed, 985 said that they drank.
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