Homework Answers
Solution: Given that n = 57, x = 8.16, sd = σ = 1.45
95% Confidence interval for Z = 1.96
95% Confidence interval for the average mean = X +/-
Z*s/sqrt(n)
= 8.16 +/- 1.96*1.45/sqrt(57)
= (7.784 , 8.536)
=> option A.
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