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1. When developing an interval estimate for the difference between two sample means, with sample sizes of n_{1} and n_{2},

a.n_{1} must be equal to n_{2}

b.n_{1} must be larger than n_{2}

c.n_{1} and n_{2} can be of different sizes,

d.n_{1} must be smaller than n_{2}

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 n_{1} = 25 and n_{2} = 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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