Question 800815
Using the simple random sample of weights of women from a data set, we obtain these sample statistics: n=45 and x-bar =141.71 lbs. Research from other sources suggest that the population of weights of women has a standard deviation given by o=32.44 lbs.
a) Find the best point estimate of the mean weight of all women.
Ans: x-bar = 141.75
------------------------------------
b) Find a 90% confidence interval estimate of the mean weight of all women
E = 1.654*32.44/sqrt(45) = 8
======
90% CI: 141.71-8 < mu < 141.71+8
====================================

Cheers,
Stan H.
=====================