statistics
posted by KK .
you are asked to estimate the average weight of an adult male passenger for a study to maximize the number of seats in a certain airplane. you collect random weights of 1000 men passengers from a population of 100,000. you find that the average man in the sample weighs 180 pounds and the standard deviation of the sample is 30 pounds. what is the 95% confidence interval?

95% = mean ± 1.96 SEm
SEm = SD/√n
I'll let you do he calculations.