Correlation and Quiz

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 SS_XSS_Y 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.