Homework Answers
Confidence Interval
X̅ ± t(α/2, n-1) S/√(n)
t(α/2, n-1) = t(0.05 /2, 30- 1 ) = 2.045
31.3 ± t(0.05/2, 30 -1) * 11.7/√(30)
Lower Limit = 31.3 - t(0.05/2, 30 -1) 11.7/√(30)
Lower Limit = 26.9316
Upper Limit = 31.3 + t(0.05/2, 30 -1) 11.7/√(30)
Upper Limit = 35.6684
95% Confidence interval is ( 26.9316 , 35.6684
)
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