Homework Answers
sample mean, xbar = 19.59
sample standard deviation, σ = 6.29
sample size, n = 45
Given CI level is 93%, hence α = 1 - 0.93 = 0.07
α/2 = 0.07/2 = 0.035, Zc = Z(α/2) = 1.81
ME = zc * σ/sqrt(n)
ME = 1.81 * 6.29/sqrt(45)
ME = 1.7
CI = (xbar - Zc * s/sqrt(n) , xbar + Zc * s/sqrt(n))
CI = (19.59 - 1.81 * 6.29/sqrt(45) , 19.59 + 1.81 *
6.29/sqrt(45))
CI = (17.89 , 21.29)
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