Homework Answers
Soln
From the given sample,
Mean = 8.23
Std Deviation(s) = 3.99
n = 30
Std Error (SE) = 3.99/301/2 = 0.73
a)
Mean of the Weight = 8.23
b)
Population Mean = 8.23
c)
At alpha = 0.05,
ZCritical = 1.96
Hence
95% CI = Mean +/- ZCritical * SE = 8.23 +/- 1.96*0.73 = {6.8,15.04}
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full-term infants. The standard deviation of birth weights in this
population is 2 pounds. Calculate 95% confidence intervals for μ
for samples in which:
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c) Which sample provides the most precise estimate of the mean
birth weight?
d) Interpret the CI you computed in part a).
2. P-value and confidence interval. A...
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