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17#14 A variable of two populations has a mean of 46 and a standard deviation of...

17#14

A variable of two populations has a mean of 46 and a standard deviation of 14 for one of the populations and a mean of 47 and a standard deviation of 14 for the other population.

a) For independent samples of sizes 46 and 56, respectively, find the mean and standard deviation of  x¯1−x¯2.
mean:

standard deviation:

b) Can you conclude that the variable  x¯1−x¯2 is approximately normally distributed? (Answer yes or no)
answer:

Math   Statistics-And-Probability   
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