1. p < .01 means that the a. null hypothesis should be rejected; b. difference i

Question

1. p < .01 means that the

a. null hypothesis should be rejected;
b. difference is statistically significant;
c. both of the descriptive alternatives are correct;
d. neither of the descriptive alternatives is correct.

2. If you find that there is a logical reason to pair the scores from the two groups in a two-group experiment, you know that you

a. have an independent-samples design;

b.   have a paired-samples design;

c. should use a two-tailed critical value;

d.   can use confidence intervals but not hypothesis testing.

3. The denominator of a paired-samples t test is a standard error of a difference.

a. true

b. false

4. Which of the following phrases uses "significant" in its statistical sense?

a. The detective called the broken glasses a significant clue.

b. We measured how long it took groups to play "Clue" and how long to play "Monopoly." Clue happens significantly quicker.

c. The significant monopoly in America in the 1950's was AT&T.

d. The AT&T court case consumed a significant portion of his 30-year career in law.

5. An effect size index that is considered small is

a. less than 0;

b. 0.20;

c. 1.00;

d. 1.96;

e. 2.58.

6. A one-tailed test of significance produced a t equal to -2.30, significant at the .05 level. The design of this experiment

a. was a paired-samples design;

b. was an independent-samples design;

c. could have been either a paired- or an independent-samples design.

7. p > .05 means that the

a. null hypothesis should be rejected;

b. difference between the two means is statistically significant;

c. both of the descriptive alternatives are correct;

d. neither of the descriptive alternatives is correct.

8. In an independent samples design the Hatfields had a mean score of 25 against a mean score of 26 for the McCoys. Low scores mean better performance. The researcher ran a two-tailed test with a at .05. A t value of 1.99 was found.

a. If df = 40, the Hatfields are significantly better than the McCoys.

b. If df = 40, the McCoys are significantly better than the Hatfields.

c. If df = 120, the Hatfields and the McCoys are not significantly different.

d. If df = 120, the Hatfields are significantly better than the McCoys.

e. If df = 120, the McCoys are significantly better than the Hatfields.

Explanation / Answer

1
c. both of the descriptive alternatives are correct;

2
b. have a paired-samples design;

3
a. true

4
b. We measured how long it took groups to play "Clue" and how long to play "Monopoly." Clue happens significantly quicker.

5
b. 0.20;

6
c. could have been either a paired- or an independent-samples design.

7
d. neither of the descriptive alternatives is correct.

8
c. If df = 120, the Hatfields and the McCoys are not significantly different.

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