SOLUTION: a sample of 16 ten-year old girls had a mean weight of 71.5 and a standard deviation of 12 pounds, respectively. Assuming normality, find the two-sided 95% confidence interval a.

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Question 911721: a sample of 16 ten-year old girls had a mean weight of 71.5 and a standard deviation of 12 pounds, respectively. Assuming normality, find the two-sided 95% confidence interval
a. 65.1, 77.9
b. 66.2, 76.8
c. 62.7, 80.3
d. 66, 77
Answer by ewatrrr(24785) About Me  (Show Source):
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Round the confidence interval limits to the same number of decimal places as the sample standard deviation
d. 66, 77
mean = 71.5, sd = 12
ME = 1.96(12)/sqrt(16)= 5.88 0r 5.9
CI: = 71.5 - 5.9 < mu < 71.5 + 5.9
CI(65.6, 77.4)