reading quiz 14

Question 1

In chapters 12 and 13, you learned techniques to compare a sample mean to a population mean. A major limitation to the single-sample experiment is that ________________________.

Answer 1

in the majority of cases, a population mean (mu) is not available

Question 2

The _____________ test treats difference scores as raw scores and tests whether these scores are a random sample from a population of difference scores having a mean of zero.

Answer 2

correlated-group t

Question 2

In the null-hypothesis population of difference scores, µD = ____.

Answer 2

0

Question 3

Now that you’ve gotten to this chapter, you know it would been preferable to use the _____________ test in place of the sign test in Chapter 10.

Answer 3

correlated groups t

Question 4

You are teaching a group of students the fundamentals of statistics and test their knowledge of the subject at the beginning and end of the semester and analyze the difference scores. The correct analytic tool would be ________________________.

Answer 4

a correlated groups t test

Question 5

Your experiment has an experimental and a control group. There are 10 participants in the experimental group and another 12 in the control group. The best test to use to determine whether there is a difference between the mean scores on a particular variable is to use _____________________________.

Answer 5

an independent-groups t test (unequal sample size)

Question 6

Which two of the following are assumptions underlying the use of the independent-groups t test?

Answer 6

• The sampling distribution of the difference between sample means (X-bar 1 minus X-bar 2) is normally distributed.
• There is homogeneity of variance.

Question 7

________________________ is used to convey effect size in an independent-groups t test.

Answer 7

Cohen’s d

Question 8

Which one of the following is associated with decreased power in an independent-groups t test?

Answer 8

high sample variability

Question 9

You perform an independent-groups t test and then calculate the effect size and confidence interval. You find that the 95% CI ranges from -1.4 to +1.6. Based on this information you know that _____________________________.

Answer 9

The null hypothesis should be retained.