Question

A variable of two populations has a mean of

33.4

and a standard deviation of

18.3

for one of the populations and a mean of

33.4

and a standard deviation of

23.9

for the other population.For independent samples of size

6246

and

47854

​respectively, find the mean and standard deviation of

x overbar 1 minus x overbar 2x1−x2.

The mean of

x overbar 1 minus x overbar 2x1−x2

is

nothing.

​(Type an integer or a​ decimal.)

The standard deviation of

x overbar 1 minus x overbar 2x1−x2

is

nothing.

Answer 1