SOLUTION: A study of women�s weights found that a randomly selected sample of 234 women had a mean weight of 157.3 lb. Assuming that the population standard deviation is 15.6 lb., construct

Question 1069524: A study of women�s weights found that a randomly selected sample of 234 women had a mean weight of 157.3 lb. Assuming that the population standard deviation is 15.6 lb., construct a 95% confidence interval estimate of the mean weight of all women. Choose the correct interval from below:
(145.3, 160.5)
(155.3, 159,3)
(165.5, 173.5)
(185.7, 199.3)
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
I can use z assuming normality and a large sample size.
the half-interval size is z(0.975)* s/ sqrt (n)=1.96*15.6/sqrt (239)
=1.98
The half-interval is added and subtracted from the mean
(155.3,159.3)
B.
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