Independent random sampling from two normally distributed populations gives the following results nx 81 x bar 140 2x 25 ny 100 y bar 120 2y 14 Find a 95 confidence interval estimate of the difference between the means of the two populations ...

Using independent random samples f ...

Independent random sampling from two normally distributed populations gives the following results: nx = 81; x-bar =

Question:

Independent random sampling from two normally distributed populations gives the following results:
nx = 81; x-bar = 140; σ2x = 25
ny = 100; y-bar = 120; σ2y = 14
Find a 95% confidence interval estimate of the difference between the means of the two populations.