95% Confidence Interval

A snack food manufacturer selected a sample of 15 bags of pretzels off the assembly line and weighed their contents. If the sample mean is 10.0 and the sample standarddeviation is 0.15, find the 95% confidence interval estimate for the true mean weight of bags of this type of pretzel.

A. (9.92, 12.34)
B. (8.54, 11.46)
C. (10.42, 10.58)
D. (9.92, 10.08)


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