Capella PSYC4700 Week 9 Quiz Latest 2023

Question # 00647056
Subject: Psychology
Due on: 06/06/2023
Posted On: 06/06/2023 02:10 AM
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PSYC4700 - Stat for Behavioral Sciences

Week 9 Quiz 1

Question 1

The correlation coefficient is used to measure the ______ and ______ of the linear relationship between two factors.                                

a. date, time

b. mean, variance

c. significance, effect size

d. strength, direction

Question 2

The numerator of the correlation coefficient measures the extent to which two variables ______.         

a. vary at random

b. vary independently

 c. covary

d. none of these

Question 3

A researcher conducts a chi-square goodness-of-fit test in which k = 5. What is the critical value for this test at a .05 level of significance?                                     

a. 4

b. 5

 c. 9.49

d. 11.07

Question 4

Suppose a correlation is computed in each of two samples. If the value of SS XY is the same in each sample, and the square root of SS X SS 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

Question 5

True or False: The point-biserial correlation coefficient is used to measure the correlation between two dichotomous variables.                                            

True

False

Question 6

True or False: Correlation does not show causation.                                       

True

False

Question 7

True or False: The sign (+ or -) of a correlation coefficient indicates the direction of a relationship between two factors.                                

True

False

Question 8

True or False: The correlation coefficient varies between 0 and 1 and can never be negative.                     

True

False

Question 9

Which of the following is the assumption that the best way to describe the pattern of data is using a straight line?                                           

a. normality

 b. linearity

c. homoscedasticity

d. restriction of range

Question 10

The appropriate correlation coefficient for measuring the direction and strength of the linear relationship between one continuous and one dichotomous variable is ______.                                    

a. the Spearman rank-order correlation coefficient

 b. the point-biserial correlation coefficient

c. the phi correlation coefficient

d. none of the above

Question 11

The point-biserial correlation coefficient is a measure of the direction and strength of the linear relationship between two variables, where ______.                                           

a. both variables are on an ordinal scale

b. one is at interval level or higher and one is ordinal

c. one is continuous, and one is dichotomous

d. both variables are on a nominal scale

Question 12

The appropriate correlation coefficient for measuring the direction and strength of the linear relationship between two ranked or ordinal variables is ______.                                   

a. the Spearman correlation coefficient

b. the point-biserial correlation coefficient

c. the phi correlation coefficient

d. none of these

 

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