For the regression equation, = 3X - 9, what can be determined about the correlation between X and Y?

Select one:

a.

The correlation definitely will be negative.

b.

The correlation definitely will be positive.

c.

The correlation will be relatively large and positive.

d.

The correlation will be zero.

A sample of n = 25 scores produces a t statistic of t = 2.062. If the researcher is using a two-tailed test, then which of the following is the correct statistical decision?

Select one:

a.

The researcher must fail to reject the null hypothesis with either = .05 or = .01.

b.

It is impossible to make a decision about H0without more information.

c.

The researcher can reject the null hypothesis with = .05 but not with = .01.

d.

The researcher can reject the null hypothesis with either = .05 or = .01.

For a fixed level of significance, the critical value for the chi-square will ____.

Select one:

a.

decrease as the df value increases

b.

increase as the df value increases

c.

increase as the sample size increases

d.

decrease as the sample size increases

A sample of n = 100 people is classified into four categories. If the results are evaluated with a chi-square test for goodness of fit, what is the df value for the chi-square statistic?

Select one:

a.

3

b.

99

c.

4

d.

100

Under what circumstances is the phi-coefficient used?

Select one:

a.

when one variable consists of ranks and the other is regular, numerical scores

b.

when one variable is dichotomous and the other is regular, numerical scores

c.

when both X and Y are dichotomous variables

d.

when both variables consists of ranks

Compared to a z-score, a hypothesis test with a t statistic requires more information from the sample.

Select one:

a.

True

b.

False

The larger the differences among the sample means, the larger the numerator of the F-ratio will be.

Select one:

a.

True

b.

False

When comparing more than two treatment means, should you use an analysis of variance rather than using several t tests, and if so, why?

Select one:

a.

No. There is no advantage to using an analysis of variance rather than several t tests.

b.

Yes. Using several t tests increases the risk of a Type II error.

c.

Yes. Using several t tests increases the risk of a Type I error.

d.

Yes. The analysis of variance is more likely to detect a treatment effect.

In ANOVA, post hoc tests (pairwise comparisons) are only necessary when we fail to reject the null hypothesis.

Select one:

a.

False

b.

True

With = .01 the two-tailed critical region for a t test using a sample of n = 16 subjects would have boundaries of ____.

Select one:

a.

t = 2.921

b.

t = 2.947

c.

t = 2.583

d.

t = 2.602