SOLUTION: find the sample size necessary to estimate the mean weight of all supermodels so that there is 95% confidence that the sample mean is in error by no more than 2 lb. assume that a
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Question 852820: find the sample size necessary to estimate the mean weight of all supermodels so that there is 95% confidence that the sample mean is in error by no more than 2 lb. assume that a pilot study suggests that the weights of all supermodels have a std dev of 7.5 lbs
weights of models - 125/127/119/105/128/123/125/110/119/103 Answer by ewatrrr(24785) (Show Source):
Hi,
= C z = 1.28155
90% z =1.645
92% z = 1.751
95% z = 1.96
98% z = 2.326
99% z = 2.576
ME = 1.96*7.5/sqrt(n) < 2, n = 54.0225 0r 55 rounded Up
sample size necessary is 55
