Chapter 11 iClicker Questions
1. An independent samples t test is used with which type of research design?
a) a within groups design
b) a between groups design
c) a paired samples design
d) a single sample design
2. When using an independent samples t test we have to create a:
a) distribution of differences between means.
b) difference score for each participant.
c) distribution of differences between raw scores.
d) distribution of the population.
3. When conducting a study of gender differences, we have to employ a(n):
a) single sample t test.
b) paired sample t test.
c) dependent samples t test.
d) independent sample t test.
4. Which of the following statements is a correctly worded null hypothesis
for an independent sample t test?
a) On average, women categorize the same percentage of cartoons as
funny as men do.
b) On average, women categorize a different percentage of cartoons as funny
as men do.
c) On average, women categorize a smaller percentage of cartoons as funny
as men do.
d) On average, women categorize a larger percentage of cartoons as funny as
men do.
5. One difference between calculating an independent samples t test for a
paired samples t test is that with the independent samples t test, we use the:
a) research hypothesis, not the null hypothesis.
b) median, not the mean.
c) variance, not the standard deviation.
d) standard deviation, not the variance.
6. The weighted average of the two estimates of variance (one from each
sample) that are calculated when conducting an independent-samples t test is
referred to as:
a) standard error.
b) pooled variance.
c) degrees of freedom.
d) the confidence interval.
7. The formula for the degrees of freedom total is which of the following?
a) Df total = N- 1
b) Df total = dfx X dfy
c) Df total = dfx - dfy
d) Df total = dfx + dfy
8. If a t score is calculated to be -.03 and our critical values are -2.365 and
2.365, what decision do we make about our research study?
a) Fail to reject the null hypothesis.
b) Reject the null hypothesis.
c) Accept the null hypothesis.
d) Accept the research hypothesis.
9. Which statement is true about final decisions make from a t test?
a) Hypothesis tests provide more information then confidence intervals.
b) Confidence intervals provide more information than hypothesis tests.
c) Hypothesis tests and confidence intervals are the same thing.
d) Effect size cannot be calculated for t tests.
10. For an independent samples t test, which statistic do we use to measure
effect size?
a) Cohen’s d
b) pooled variance
c) confidence intervals
d) degrees of freedom
11. In data transformations, such as the square root transformation, are
useful:
a) when there have not been enough subjects tested to conduct a proper
analysis.
b) when you want to change the value of some scores in the data set, but not
all of them.
c) when you want the data in a skewed data set to be more normal.
d) when you want to increase the variance of your scores.