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

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c. alternative hypothesis should state P1 - P2 > 0

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1. If we are interested in testing whether the proportion of items in population 1 is larger than the proportion of items in population 2, the

a. null hypothesis should state P1 - P2 < 0

b. null hypothesis should state P1 - P2 ≥ 0

c. alternative hypothesis should state P1 - P2 > 0

d. alternative hypothesis should state P1 - P2 < 0

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b. is not restricted to small sample situations

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2. To compute an interval estimate for the difference between the means of two populations, the t distribution

a. is restricted to small sample situations

b. is not restricted to small sample situations

c. can be applied when the populations have equal means

d. None of these alternatives is correct.

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c. alternative hypothesis should state P1 - P2 > 0

1. If we are interested in testing whether the proportion of items in population 1 is larger than the proportion of items in population 2, the

a. null hypothesis should state P1 - P2 < 0

b. null hypothesis should state P1 - P2 ≥ 0

c. alternative hypothesis should state P1 - P2 > 0

d. alternative hypothesis should state P1 - P2 < 0