Related-Samples t Tests and Quiz

Related-Samples t Tests and Quiz

QUESTION 1

1. All other things being equal, as the sample size increases, what happens to the critical value for a related samples t test (or for any t test, for that matter)?

   	a.	It depends on the value of the test statistic.
   	b.	The critical value decreases.
   	c.	The critical value does not change.
   	d.	The critical value increases.

10 points

QUESTION 2

1. Which of the following is a characteristic of confidence intervals?

   	a.	Both of the other choices are correct.
   	b.	The less certain an estimate, the more precise the estimate.
   	c.	The more certain an estimate, the less precise the estimate.

10 points

QUESTION 3

1. A researcher records the time it takes (in seconds) for participants to respond (by pressing a key) to a familiar versus an unfamiliar word flashed onto a computer screen. In this study, the difference in response time for each participant is compared. The type of design described here is called a:

   	a.	Repeated measures design.
   	b.	Matched samples design.
   	c.	Both A and B.

10 points

QUESTION 4

1. The denominator of the test statistic for a related samples t test:

   	a.	Provides an estimate of the error associated with the original scores.
   	b.	Is the sum of the difference scores for each participant.
   	c.	Compares mean differences observed to the mean differences stated in a null hypothesis.
   	d.	Provides an estimate of the error associated with the difference scores.

10 points

QUESTION 5

1. Each of the following is needed to compute the estimated Cohen’s d, except:

   	a.	The mean difference.
   	b.	The standard error.
   	c.	The standard deviation of difference scores.

10 points

QUESTION 6

1. For the related samples t test, assuming that all other values remain constant, as samples size increases:

   	a.	The value of the test statistic increases.
   	b.	The power to detect an effect increases.
   	c.	The estimate for standard error decreases.
   	d.	All of the above.

10 points

QUESTION 7

1. Each of the following is an advantage for using the related samples design, except:

   	a.	It increases the variability measured in a study.
   	b.	It increases the power of a research design.
   	c.	It minimizes standard error.
   	d.	It can be more practical.

10 points

QUESTION 8

1. A researcher selects a sample of 36 dog owners and measures their responsiveness to pictures depicting the humane and inhumane treatment of dogs. The researcher finds that responsiveness significantly differed, t = 3.243. Use eta-squared to compute the proportion of variance for this result.

   	a.	There is not enough information to answer this question.
   	b.	η2 = 0.23.
   	c.	η2 = 0.21.
   	d.	η2 = 0.25.

10 points

QUESTION 9

1. To increase the value of estimated Cohen’s d, a researcher increases the sample size. Will this change the value of d?

   	a.	No; the sample size is not used to compute effect size.
   	b.	Yes; as sample size increases, effect size increases.
   	c.	Yes; as sample size increases, effect size decreases.
   	d.	No; as sample size increases, effect size decreases.

10 points

QUESTION 10

1. Which of the following words best describes certainty?

   	a.	Inferential.
   	b.	Confidence.
   	c.	Significance.
   	d.	Precision.

10 points

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