Data table: 5 6 9 8 7 5 6 6 5 6 5 6 7 8

a. What is the mean family size for the sample ? ________ (round off to the nearest tenth as needed)

b. What is the standard deviation for the sample is _____________(round off to the nearest tenth as needed)

c. What is the best estimate for the mean family size for the population of all families in a country? ______________ (round off to the nearest tenth as needed)

What is the 95% confidence interval for the estimate? __________< u < _____________

Comment on the reliability of the estimate. Choose the correct answer below.

a. The sample is likely to be representative of all families in a country.

b. The sample is unlikely to be very representative of all families in a country.

c. There is not enough data to make a conclusion.

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