Question

Sample variability

74 Using the phone numbers listed in your directory as your population, obtain randomly 20 samples of size 3. From each phone number identified as a source, take the fourth, fifth, and sixth digits. (For example, for 245-8268, you would take the 8, the 2, and the 6 as your sample of size 3.) a. Calculate the mean of the 20 samples. b. Draw a histogram showing the 20 sample means. (Use classes-0.5 to 0.5, 0.5 to 1.5, 1.5 to 2.5, and so on.) (shape of distribution, center, amount of dispersion). the histogram in (b). Describe the distribution that c. Describe the distribution of x's that you see in (b) d. Draw 20 more samples and add the 20 new x's to seems to be developing.

Answer 1

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