How many women must be randomly selected to estimate the mean weight of women in one age group. We want 90% confidence that the sample mean is within 2.1 lb of the population mean, and the population standard deviation is known to be 19 lb. Please show work.
Added by Joshua S.
Step 1
Step 1: We know that the formula for the sample size is given by: n = (Z^2 * σ^2) / E^2 where: n = sample size Z = Z score (which corresponds to the desired confidence level) σ = standard deviation of the population E = margin of error Show more…
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