Question: The actual voltages of power packs labeled as 12 volts are as follows:

11.77, 11.90, 11.64, 11.84, 12.13, 11.99, 11.77.

a Referring to the above, a confidence interval for this sample would be based on the t distribution with ____ 6 ______ degrees of freedom.

b. Referring to the above, the critical t value for a 99% confidence interval for this sample is ____ 3.707 ______.

c. Referring to the above, a 99% confidence interval for the mean voltage of the power packs is from ___ 11.6374 _______ to ____ 12.0886 ______.

d. Referring to the above, it is possible that the 99% confidence interval calculated from the data will not contain the mean voltage for the sample.

1. True
2. False

e. Referring to the above, a 99% confidence interval will contain 99% of the voltages for all such power packs.

1. True
2. False

f. Referring to the above, a confidence interval estimate of the population mean would only be valid if the distribution of voltages is normal.

1. True
2. False

g. Referring to the above, it is possible that the 99% confidence interval calculated from the data will not contain the mean voltage for the entire population.

1. True
2. False

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