1. Two samples are related if each observation in one sample is paired with

a.all observations in the other sample.

b.a single observation in the other sample.

c.none of the observations in the other sample.

d.a subset of observations in the other sample.

2. Which one of the following doesnotillustrate two related samples?

a.Schoolchildren are measured before and after the school term.

b.Identical twins are split into two groups.

c.College freshmen are split into two groups.

d.Marital couples are split into two groups.

3. The sample sizes for two related samples must be

a.approximately equal.

b.equal.

c.very large.

d.not too small.

4. Thetdistribution ismostdifferent from the standard normal distribution when sample size is

a.large.

b.very large.

c.very small.

d.infinitely large.

5. To save space,ttables supply only critical values oftfor a few of the more common

a.types of investigations.

b.sample sizes.

c.levels of significance.

d.null hypotheses.

6. If the desired number of degrees of freedom doesn't appear in thettable, use the criticaltassociated with

a.either of the nearest twodfentriesin the table.

b.the next largestdfin the table.

c.the next smallestdfin the table.

d.a different level of significance.

7. Use analysis of variance rather than attest whenever the null hypothesis makes a claim about

a.the population shape.

b.the population variance.

c.more than one population mean.

d.more than two population means.

8. The null hypothesis assumes that the difference between population means is

a.unknown.

b.virtually zero.

c.some number reflecting the research hypothesis.

d.zero.