Homework Answers
Answer:
Given,
sample n = 30
degree of freedom = n - 1
= 30 - 1
= 29
alpha = 0.05
t(alpha/2 , df) = t(0.05/2 , 29) = 2.045
95% CI = xbar +/- t*s/sqrt(n)
substitute values
= 31.3 +/- 2.045*11.7/sqrt(30)
= 31.3 +/- 4.3684
= (26.9316 , 35.6684)
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