Question

Salaries of 49 college graduates who took a statistics course in college have a mean, x, of $67,200. Assuming a standard deviation, o, of $15,485, construct a 95% confidence interval for estimating the population mean u. Click here to view at distribution table. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. $ <u<$ (Round to the nearest integer as needed.)

Answer 1

we have given i. na sample sample size 49 z - sample mean = $ 67,200 ra Popular on standard deviations 15485 952 confidence interval for estimating the population mean u. u=că 2012 * ol50 where 2012 Critical value

here = 1 -0.95 =ooos za (from table) u +1.96 zoos = 15485) .:: 4 = ( 67200 t (1.96* و ہال (67200 † 4335.8) = [ 62864.2 71535.8) (62864, 71536) ► < u uc < $ 71536 $ 62864 * coe can say 95% confident that population mean lies within ${62864 to $$1536 (M) is