You select a random sample of n = 31 families in your neighborhood and find the following family sizes (number of people in the family):

a. What is the mean family size for the sample?
b. What is the standard deviation for the sample?
c. What is the best estimate for the mean family size for the population of all American families?
d. What is the 95% confidence interval for the estimate?
e. Comment on the reliability of the estimate.

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