Question: 8.7 Independent random sampling from two normally distributed populations gives the following results: nx = 81; x = 140; s2x = 25 ny = 100;

8.7 Independent random sampling from two normally distributed populations gives the following results:

nx = 81; x = 140; s2x

= 25 ny = 100; y = 120; s2y

= 14 Find a 95% confidence interval estimate of the difference between the means of the two populations.

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