1.)A nonparametric test should be used especially when? a.)the population distri

ID: 3180778 • Letter: 1

Question

1.)A nonparametric test should be used especially when?

a.)the population distribution departs substantially from normality and the sample size is less than 20.

b.) the population is normally distributed and the sample size is more than 30.

c.) he population distribution departs substantially from normality and the sample size is 50 or more.

d.) the population is normally distributed and the sample size is less than 20.

2.) To perform the rank-sum test:

A.) the two groups must be the same size.

b.) the ranks for one group are added to the ranks for the other group.

c.) the scores are combined into one large group before ranking.

d.) the scores are ranked separately for each group.

3.) A nonparametric statistical test:

a.) does not estimate the value of a population mean or standard deviation.

b.) neither.

c.) does not use a null and alternative hypothesis.

d.) both

The correct option is put in bold and the explanation in italics.

1.)A nonparametric test should be used especially when?

a.)the population distribution departs substantially from normality and the sample size is less than 20.

If the sample size is more than 20, a normal approximation works in most cases.

b.) the population is normally distributed and the sample size is more than 30.

c.) he population distribution departs substantially from normality and the sample size is 50 or more.

d.) the population is normally distributed and the sample size is less than 20.

2.) To perform the rank-sum test:

A.) the two groups must be the same size.

b.) the ranks for one group are added to the ranks for the other group.

c.) the scores are combined into one large group before ranking.

Combining into a large group facilitates the rank comparison.

d.) the scores are ranked separately for each group.

3.) A nonparametric statistical test:

a.) does not estimate the value of a population mean or standard deviation.

b.) neither.

c.) does not use a null and alternative hypothesis.

d.) both

PS: In general, all the 4 options are wrong but the most plausible answer is (a).

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