# correlation and quiz

### QUESTION 1

1. We compute the frequency expected in each category using known ________ stated in the null hypothesis.
 a. Hypothesis tests. b. Effect sizes. c. Proportions. d. Variances.

10 points

### QUESTION 2

1. Which of the following is a statistical procedure used to test hypotheses about the discrepancy between the observed and expected frequencies in two or more nominal categories?
 a. One-way ANOVA. b. All of these answers are correct. c. Chi-square test. d. Analysis of regression.

10 points

### QUESTION 3

1. A chi-square goodness-of-fit test shows that the frequencies observed fit well with those that were expected. Hence, the decision was to:
 a. No decision was made. b. Retain the null hypothesis. c. Reject the null hypothesis.

10 points

### QUESTION 4

1. What is the key assumption for a chi-square goodness-of-fit test?
 a. All answers are correct. b. Observed frequencies are independently recorded in each cell. c. The population is normally distributed. d. Expected frequencies are homogeneous.

10 points

### QUESTION 5

1. Suppose a correlation is computed in each of two samples. If the value of is the same in each sample, and the square root of SSXSSY is larger in sample 1, then in which sample will the value of the correlation coefficient be larger?
 a. Sample 1. b. Sample 2. c. None; the correlation coefficient will be the same in both samples. d. There is not enough information to answer this question.

10 points

### QUESTION 6

1. To summarize correlations, we report:
 a. The strength of the correlation. b. The p value . c. The direction of the correlation. d. All of these answers are correct.

10 points

### QUESTION 7

1. The coefficient of determination is:
 a. A measure of effect size. b. Mathematically equivalent to eta-squared. c. All of these answers are correct. d. Equal to the correlation coefficient squared.

10 points

### QUESTION 8

1. Which of the following is the assumption that the best way to describe the pattern of data is using a straight line?
 a. Restriction of range. b. Homoscedasticity. c. Linearity. d. Normality.

10 points

### QUESTION 9

1. When computing a chi-square goodness-of-fit test, the frequency expected in a given cell should never be less than:
 a. The sample size. b. The number of cells. c. The frequency observed. d. Five.

10 points

### QUESTION 10

1. A researcher computes a 3 x 5 chi-square test for independence. What are the degrees of freedom for this test?
 a. 8 b. 5 c. 15 d. 3

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