A psychologist is interested in the relationship between extraversion and aggres

Question

A psychologist is interested in the relationship between extraversion and aggression. Specifically, the researcher hypothesized that greater extraversion is associated with greater aggression. The data below show the extraversion scores, ranging from 1-5, and the aggression scores, ranging from 1-10, for a sample of 5 students. Assume that extraversion and aggression are both numeric, and use an alpha of .05.

1. What is the appropriate test to evaluate the hypothesis above? (1)

a. two-way independent ANOVA

b. Pearson- Product Moment correlation

c. simple linear regression

d. one-way independent ANOVA

2. State the hypotheses in words and notation. If it is not possible to write it in notation form, then say that. (2 pts)

Null hypothesis (words): _______________________________________________________________

Null (notation): ____________________

Alternative hypothesis (words): __________________________________________________________

Alternative (notation): ___________________

3. Find the critical value for this test statistic. (1 point)

a. .8783

b. 8114

c. .7293

d. .8054

Extraversion           Aggression

                  X                                                   Y                           

                  5                                                   6

                  5                                                   8

                  4                                                   9             

                  3                                                   4             

                  2                                                   5           

X =     19                                    Y = 32         

SSx =        6.8                                SSy = 17.2

4. On the basis of the data above, calculate the appropriate test statistic. (3 points)

a. 1.31

b. .64

c. .5920

d. .1379

5. Do you reject H0? (1 pt)

a. Yes

b. No

6. Interpret your findings by stating what this suggests about the relationship between extraversion and aggression. Be sure to say what test you use, include the appropriate statistics, and write it in APA style. (2 points)

Explanation / Answer

1. Correct answer: b. Pearson- Product Moment correlation

2. H0: greater extraversion is not associated with greater aggression

H1: greater extraversion is associated with greater aggression

3. the critical value for this test statistic.

Correc answer: Option (a.) .8783

4.

calculate the appropriate test statistic. (3 points)

Correct answer: option (C) 0.5920

5. We accept H0

Correct answer: (A) Yes

6. We conclude that greater extraversion is not associated with greater aggression

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