For a given month, a random sample of 30 sales girls from a superstore has a sample mean of salary of RM 800 with standard deviations of RM 140. Estimate the mean monthly salary for all employees using the 95% confidence interval.(what does mean of 95% confidence level?)

Answer 1

sales GIRLS?

I didn't know any store hired children!

Answer 2

95% confidence interval = mean ± 1.96 SEm

SEm = SD/√n

Answer 3

COME ON MS SUE. PLEASE DON'T ANSWER MY QUESTION IF YOU DO NOT KNOW!! BE PROFESSIONAL OK.