Sampling distribution of the difference

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Reference no: EM1316878

Interval estimate for the difference between the means of two populations.

1. To construct an interval estimate for the difference between the means of two populations when the standard deviations of the two populations are unknown, we must use a t distribution with (let n₁ be the size of sample 1 and n₂ the size of sample 2)

A. (n1 + n2) degrees of freedom

B. (n1 + n2 - 1) degrees of freedom

C. (n1 + n2 - 2) degrees of freedom

D. n1 - n2 + 2

2. If two independent large samples are taken from two populations, the sampling distribution of the difference between the two sample means:

A. can be approximated by a Poisson distribution

B. will have a variance of one

C. can be approximated by a normal distribution

D. will have a mean of one

Reference no: EM1316878

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