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Multiple choice questions based on interval estimate for the difference between two samples means.

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1. When developing an interval estimate for the difference between two sample means, with sample sizes of n1 and n2,

a.n1 must be equal to n2

b.n1 must be larger than n2

c.n1 and n2 can be of different sizes,

d.n1 must be smaller than n2

2.Independent simple random samples are taken to test the difference between the means of two populations whose standard deviations are not known. The sample sizes are n1 = 25 and n2 = 35. The correct distribution to use is the

a.t distribution with 58 degrees of freedom

b.Poisson distribution

c.t distribution with 60 degrees of freedom

d.t distribution with 59 degrees of freedom

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