Deck 11: How Can I Tell If Two Variables Are Correlated Pearsons Correlation

Question 1

An r value of +.62 would represent what kind of relationship?

A) A strong positive relationship
B) A moderate positive relationship
C) A weak negative relationship
D) A strong negative relationship

Answer 1

A
Explanation: It is positive, as shown by the +, and an r of .62 represents a strong relationship

Question 2

An r value of -.58 would represent what kind of a relationship

A) A strong positive relationship
B) A strong negative relationship
C) A moderate positive relationship
D) A moderate negative relationship

Answer 2

D
Explanation: It is negative, as shown by the -, and an r of .58 represents a moderate relationship

Question 3

In the r equation, what does the top half of the equation represent?

A) Covariance within variables
B) Covariance between variables
C) Variance within variables
D) Variance between variables

Answer 3

B
Explanation: See the equation in Figure 11.3 p183

Question 4

You calculate a Pearson's r and the final stage of calculations give you a sum of 80/100. What kind of relationship have you found?

A) A strong positive correlation
B) A moderate positive relationship
C) A strong negative relationship
D) A moderate positive relationship

Question 5

You calculate a Pearson's r and the final stage of calculations give you a sum of -100/400. What kind of relationship have you found?

A) A weak positive relationship
B) A moderate positive relationship
C) A weak negative relationship
D) A moderate negative relationship

Question 6

The calculated df in a correlational study is 25. How many participants were in the study?

A) 28
B) 27
C) 26
D) 25

Question 7

You have a one-tailed hypothesis and df = 7. What is the critical r value with an α of .050?

A) .6664
B) .6694
C) .5822
D) .4716

Question 8

You have calculated an r of .97, with df = 5 and a two tailed hypothesis. What is the smallest α at which the finding is significant?

A) α = .050
B) α = .020
C) α = .010
D) α = .001

Question 9

A correlation analysis results is presented as: r (23) -.58, p < .010. What is incorrect about the reporting of this analysis?

A) It should be = instead of < when reporting the p value
B) There is no = between the df and the r value.
C) The negative sign should not be shown when reporting a negative relationship
D) The df should be presented after the r value

Question 10

Which of the following r values would represent a medium effect size?

A) .27
B) .59
C) .30
D) .79

Question 11

In the altruism and autistic personality traits example, what is the Σb²?

A) 666
B) 51
C) 2601
D) 363

Question 12

In the altruism and autistic personality traits example, what is Σa*b?

A) 66
B) 51
C) 371
D) 363

Question 13

In the altruism and autistic personality traits example, looking at the top half of the equation, what is the subtraction sum that needs to be calculated?

A) 371 - 66
B) 371 - 51
C) 2968 - 117
D) 2968 - 3366

Question 14

In the altruism and autistic personality traits example, what is the value that the square root is calculated on?

A) 294516
B) 542.7
C) -.7334
D) -398

Question 15

In the altruism and autistic personality traits example, how many df are there?

A) 5
B) 6
C) 7
D) 8