PSY 214:

1. Which of the following is not measured and described by a correlation?

Group of answer choices

A The direction of a relationship

B The form of a relationship

C The strength of a relationship

D The mean difference of a relationship

2. The relationship between age and height in trees is most likely a _____________ correlation.

Group of answer choices

A positive

B negative

C zero

D empty

3. Which of the following is not one of the purposes of a line of regression?

Group of answer choices

A It is a visual representation of the relationship between two variables.

B It identifies the variability of each variable.

C It identifies the central tendency of the relationship.

D It can be used for predication.

4. What can be used to conduct the hypothesis test for the Pearson correlation?

Group of answer choices

A A t statistic

B An F-ratio

C Both a and b

D Neither a nor b

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1. What can be used to conduct the hypothesis test for the Pearson correlation?

Group of answer choices

A None of the above

B T-statistics and F-Ratio

C Atstatistic

D AnF-ratio

2. In a positive correlation, the two variables tend to change in the same direction:?

Group of answer choices

A True

B False

3. What is the range for the following set of scores? Scores: 5, 15, 20,7, 9, 10, 11, 8.

Group of answer choices

A 15

B 36

C 10

D ?5

E ?4

4. In anegative correlation,the two variables tend to go in opposite directions

Group of answer choices

A True

B False

5. What is the range for the set of scores: 7, 8, 11, 15, 17, 20?

Group of answer choices

A 12

B 22

C 8

D 13

6. What is the value of ?(X - 1)²for the scores 1, 2, 1, 4??

Group of answer choices

A 10

B 16

C 18

D 12

7. Which of the following accurately describes a hypothesis test?

Group of answer choices

A ?An inferential technique that uses information about a population to make predictions about a sample

B ?A descriptive technique that allows researchers to describe a sample

C ?A descriptive technique that allows researchers to describe a population

D ?An inferential technique that uses the data from a sample to draw inferences about a population

8. If a hypothesis test produces a z-score in the critical region, what decision should be made??

Group of answer choices

A ?Fail to reject the alternative hypothesis

B ?Reject the null hypothesis

C ?Fail to reject the null hypothesis

D ?Reject the alternative hypothesis

9. ?The null hypothesis for a paired sample test states:

Group of answer choices

A ?the overall sample will have a mean difference of M_D = 0.

B ?the entire population will have a mean difference of ?_D = 0.

C ?each individual will have a difference score of about D = 0.

10. When is there a risk of a Type II error??

Group of answer choices

A ?Whenever H₁ is rejected

B ?The risk of a Type II error is unrelated to the decision of a hypothesis test.

C ?Wheneverfail to rejectH0 is the decision.

D ?Whenever H₀ is rejected

11. What is the value of ?(X + 1) for the scores 2, 4, 7??

Group of answer choices

A 5?

B 16

C 9

D ?4

12. ?In most situations, researchers would like the hypothesis test to reject the null hypothesis.

Group of answer choices

A False

B True

13. If the sample data are in the critical region with ? = .05, then the same sample data would still be in the critical region if ? were changed to .01.

?Group of answer choices

A True

B False

14. ?A Type I error occurs when a treatment actually does have an effect on the scores but the effect was not large enough to reject the null hypothesis.

Group of answer choices

A True

B False

15. The alpha level determines the risk of a Type I error.

Group of answer choices

A True

B False

16. ?If a hypothesis test using a sample of n = 16 scores produces a t statistic of t = 1.15, then the correct decision is to reject the null hypothesis for a two-tailed test with ? = .01.

Group of answer choices

A False

B True

17. For the following frequency distribution, what is ?X

X f

3 3

2 4

4 5

1 2

2 1

Group of answer choices

A 41

B ?Cannot be determined

C 10

D 8

18. For the following data, N = _____.

X f

3 3

1 1

4 5

2 2

Group of answer choices

A ?3

B ?Cannot be determined

C 11

D 5

19. ?If a set of exam scores forms a negatively skewed distribution, what can you likely conclude about the students' scores?

Group of answer choices

A ?Most of the students had relatively high scores.

B ?About an equal number of students had relatively high and relatively low scores.

C ?It is not possible to draw any conclusions about students' scores.

D ?Most of the students had relatively low scores.

20. Which of the following is an accurate definition of a Type I error??

Group of answer choices

A ?Failing to reject a true null hypothesis

B ?Rejecting a false null hypothesis

C Failing to reject a false null hypothesis

D ?Rejecting a true null hypothesis

21. What is the value of (?X)²+ 1 for the scores 2, 3, 1, 2?

?Group of answer choices

A 84

B 65

C 32

22. The critical region for a hypothesis test consists of sample outcomes that are very unlikely to occur if the null hypothesis is true.

?Group of answer choices

A True

B False

23. ?A Type I error occurs when a treatment has no effect but the decision is to reject the null hypothesis.

Group of answer choices

A False

B True

24. ?You can reduce the risk of a Type I error by using a larger sample.

Group of answer choices

A True

B False

25. A sample of n = 4 scores has SS = 60. What is the variance for this sample??

Group of answer choices

A ?60

B 20

C ?15

D ?30

26. In a repeated-measures ANOVA, what is another name for the denominator of theF-ratio

Group of answer choices

A Both a and b

B None of the above

C error variance

D residual variance

27. A sample of n = 25 scores has a mean of M = 40 and a standard deviation of s = 10. What is the estimated standard error for the sample mean?

Group of answer choices

?A 2

B ?2.5

C ?4

D ?1

28. If other factors are held constant, which set of sample characteristics is most likely to produce a significant t statistic??

Group of answer choices

A ?n = 100 with s² = 400

B ?n = 25 with s² = 400

C ?n = 25 with s² = 100

D ?n = 100 with s² = 100

29. With ? = .05, what is the critical t value for a one-tailed test with n = 15??

Group of answer choices

A ?t = 2.145

B ?t = 1.761

C ?t = 1.753

D ?t = 2.131

30. ?In general, the larger the value of the sample variance, the greater the likelihood of rejecting the null hypothesis.

Group of answer choices

A False

B True

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