Independent random sampling from two normally distributed populations gives the following results nx 64 x bar 400 x 20 ny 36 y bar 360 y 25 Find a 90 confidence interval estimate of the difference between the means of the two populations ...

Using independent random samples fi ...

Independent random sampling from two normally distributed populations gives the following results: nx = 64; x-bar =

Question:

Independent random sampling from two normally distributed populations gives the following results:
nx = 64; x-bar = 400; σx = 20
ny = 36; y-bar = 360; σy = 25
Find a 90% confidence interval estimate of the difference between the means of the two populations.