Homework Answers
Solution: Given that sample :
14,21,11,14,15,17,13,13,12,14
x = 14.4, sd = 2.836, 95% Confidence interval, n = 10
df = 9, t = 2.262
95% Confidence interval for the mean = X +/- t*s/sqrt(n)
= (14.4 +/- 2.262*2.836/sqrt(10))
= (12.371 , 16.429) rounded
The lower limit of the confidence interval = 12.371
The upper limit of the confidence interval = 16.429
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