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

Question: Independent random sampling from two normally distributed populations gives the following results: nx = 64; x-bar = 400; x = 20 ny = 36; y-bar

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.

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