Weights of women in one age group are normally distributed with a standard deviation of 23...

Question

Question

Weights of women in one age group are normally distributed with a standard deviation of 23 lb.

A researcher wishes to estimate the mean weight of all women in this age group.

Find how large a sample must be drawn in order to be 90% confident that the sample
mean will not differ from the population mean by more than 2.9 lb.

Group of answer choices

181
171
242
104
168

Answer 1

Answer #1

Answer: 171

confidence interval	1.645
z=(sample Mean-Population Mean)/alpha

alpha=standard deviation/Sample Size

alpha	1.763
Sample Size	170.182

Answer 2

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