# Question: Determine the sample size needed to construct a 90 confidence

Determine the sample size needed to construct a 90% confidence interval to estimate the population mean when σ = 75 and the margin of error equals 12.

## Relevant Questions

Determine the sample size needed to construct a 95% confidence interval to estimate the population mean when σ = 40 and the margin of error equals 6. Determine the sample size needed to construct a 95% confidence interval to estimate the population proportion for the following sample proportions when the margin of error equals 4%: a. p = 0.30 b. p = 0.40 c. p = 0.50 Determine the margin of error for a confidence interval to estimate the population mean with n = 35 and σ = 40 for the following confidence levels: a. 90% b. 95% c. 96% On June 2, 2010, major league pitcher Armando Galarraga of the Detroit Tigers lost his bid for a perfect game when umpire Jim Joyce incorrectly called a runner safe at first base with two outs in the ninth inning. ( A ...To design a new advertising campaign, Volkswagen would like to estimate the proportion of drivers of the new VW Beetle who are women. In a random sample of 250 Beetle owners, 140 of them were women. a. Construct a 95% ...Post your question