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A random sample of bolts is taken from inventory, and their lengths are measured. The average length in the sample is 5.3 inches with a

A random sample of bolts is taken from inventory, and their lengths are measured. The average length in the sample is 5.3 inches with a standard deviation of .2 inches. The sample size was 50.

A 95% confidence interval for the unknown population mean is:

a. 4.784 to 5.816 inches.

b. None of the options are correct.

c. 4.9 to 5.7 inches.

d. 5.3 inches.

e. 5.3 inches plus or minus .056.

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