Question 1

A recent study found that the more elementary students are involved in after-school activities, the less likely they are to get involved with gangs. Which of the following correlations reflects this relationship?
A) r = 1.00
B) r = .50
C) r = -.40
D) r = .00

Accepted Answer

The correct correlation is C) r = -.40, indicating a negative relationship between involvement in after-school activities and likelihood of getting involved with gangs. The more students participate in after-school activities, the less likely they are to join gangs.

Question 2

A survey of Psychology majors finds that the more "real world" experience students gained, the less likely they were to go to graduate school. Which of the following correlations reflects this relationship?
A) r = 1.00
B) r = .50
C) r = -.40
D) r = .00

Accepted Answer

The negative correlation coefficient (-.40) indicates that as the amount of "real world" experience increases, the likelihood of going to graduate school decreases. A correlation coefficient of 1.00 would indicate a perfect positive correlation, meaning that as one variable increases, the other variable also increases at the same rate. A correlation coefficient of .50 would indicate a positive correlation, but not as strong as a perfect positive correlation. A correlation coefficient of 0.00 would indicate no correlation between the two variables.

Question 3

Which of these statistics best describes the relationship in this scatterplot? 
A) r = .00
B) r = .40
C) r = -1.00
D) r = -.50

Accepted Answer

The answer of Which of these statistics best describes the...

Question 4

A correlation of ______ is BEST represented by ______.
A) .00; an ellipse (football shape)
B) 1.00; an ellipse (football shape)
C) .00; a circle
D) 1.00; a circle

Accepted Answer

A correlation of 0.00 (indicating no relationship) is best represented by a circle, as there is no pattern or tendency in the relationship between the two variables. An ellipse or football shape, as seen in choices A and B, would suggest some degree of correlation or relationship between the variables. A correlation of 1.00 (perfect positive correlation) is also best represented by a circle, as all data points would fall exactly on a straight line, forming a circle.

Question 5

A recent study found that the more money schools are given to provide after-school activities, the less likely their students are to get involved with illegal activities. Which of the following correlations reflects this relationship?
A) r = .75
B) r = .30
C) r = -.35
D) r = .00

Accepted Answer

A negative correlation (r = -.35) indicates that as one variable increases, the other decreases. In this context, as the amount of money for after-school activities increases, involvement in illegal activities decreases.

Question 6

Which of these statistics BEST describes the relationship in this scatterplot? 
A) r = .00
B) r = .50
C) r = -.50
D) r = 1.00

Accepted Answer

The scatterplot shows no clear linear trend or relationship between the two variables. Therefore, the correlation coefficient (r) is close to zero, which corresponds to choice A.

Question 7

Which of these statistics BEST describes the relationship in this scatterplot? 
A) r = .00
B) r = .50
C) r = -.50
D) r = 1.00

Accepted Answer

The answer of Which of these statistics BEST describes the...

Question 8

Which of these statistics BEST describes the relationship in this scatterplot?  
A) r = 1.00
B) r = .40
C) r = -.40
D) r = .00

Accepted Answer

The answer of Which of these statistics BEST describes the...

Question 9

An instructor finds that, in general, the more other instructors use Powerpoint presentations and web sites, the less often students attend class. Which of the following correlations reflects this relationship?
A) r = .50
B) r = -.50
C) r = 1.00
D) r = -1.00

Accepted Answer

The answer of An instructor finds that, in general, the...

Question 10

An instructor finds that, in general, the more time students spend on laptop computers during class, the less often students take notes. Which of the following correlations reflects this relationship?
A) r = .50
B) r = -.50
C) r = 1.00
D) r = -1.00

Accepted Answer

The answer of An instructor finds that, in general, the...

Question 11

Which of these statistics BEST describes the relationship in this scatterplot? 
A) r = .50
B) r = -.50
C) r = -1.00
D) r = .00

Accepted Answer

The answer of Which of these statistics BEST describes the...

Question 12

A Pearson correlation of ______ is BEST represented by ______.
A) .50; a line
B) 1.00; a circle
C) .00; a circle
D) -1.00; an ellipse (football shape)

Accepted Answer

A Pearson correlation of .00 indicates no linear relationship, which is best represented by a circle, as the data points are scattered without any specific direction.

Question 13

An instructor finds she is completely unable to predict student's performance in her class from her initial impression of them. Which of the following correlations BEST reflects the relationship between her impressions and their performance?
A) r = -1.00
B) r = .00
C) r = .40
D) r = -.50

Accepted Answer

A correlation of zero (r = .00) indicates no linear relationship between the instructor's initial impression and the students' performance. This means that the instructor's impression does not influence or predict the students' performance in any way.

Question 14

Which of these statistics best describes the relationship in this scatterplot?  
A) r = 1.00
B) r = .65
C) r = -.40
D) r = .00

Accepted Answer

The scatterplot shows a positive linear relationship between the two variables, and the correlation coefficient (r) is estimated to be around .65. Option A is incorrect because there is some variability in the data points and not all points perfectly fit the line. Option C is incorrect because there is a positive relationship, not a negative one. Option D is incorrect because there is indeed an association between the two variables, as demonstrated by the pattern in the scatterplot.

Question 15

A Pearson correlation of ______ is BEST represented by ______.
A) .50; an ellipse (football shape)
B) 1.00; a curve
C) .00; a line
D) -1.00; an ellipse (football shape)

Accepted Answer

A Pearson correlation coefficient of .50 indicates a moderate positive correlation. This is best represented by an ellipse with a football shape, as the points on a scatterplot will be somewhat grouped together in a diagonal pattern. An absolute value of 1.00 indicates a perfect correlation, which could be represented by a straight line or a curve. A correlation of 0.00 indicates no correlation, which would be represented by a random scatter of points. A correlation of -1.00 indicates a perfect negative correlation, which could also be represented by an ellipse.

Question 16

Which of these statistics BEST describes the relationship in this scatterplot? 
A) r = -1.00
B) r = .10
C) r = .50
D) r = -.45

Accepted Answer

The scatterplot shows a negative slope, indicating an inverse relationship between the two variables. The data points also do not fall in a tight cluster, suggesting a weak correlation. The closest correlation coefficient listed is -.45, indicating a moderate negative correlation.

Question 17

An instructor finds the more often students ask for help in office hour visits, the greater the improvement in their performance across the semester. Which of the following correlations BEST reflects this relationship between asking for help and course performance?
A) r = -1.00
B) r = .05
C) r = -.50
D) r = .45

Accepted Answer

A positive correlation is needed to reflect that more office hour visits are associated with higher course performance. The correlation coefficient should also be of moderate strength to indicate a significant relationship, but not perfect (r = -1.00). Therefore, option D (r = .45) is the best choice, as it reflects a moderate positive correlation between asking for help in office hours and the improvement in course performance.

Question 18

Which of these statistics BEST describes the relationship in this scatterplot? 
A) r = -1.00
B) r = .05
C) r = -.50
D) r = .45

Accepted Answer

The answer of Which of these statistics BEST describes the...

Question 19

A correlation of ______ is BEST represented by ______.
A) .00; an ellipse (football-shape)
B) 1.00; a circle
C) .00; a line
D) 1.00; a line

Accepted Answer

A correlation of 1.00 indicates a perfect positive linear relationship between two variables, which is best represented by a straight line.

Question 20

A researcher finds that the more hours students spend studying, the fewer mistakes they make on their assignments. Which of these statistics BEST describes this relationship?
A) r = 1.00
B) r = .50
C) r = -.50
D) r = .00

Accepted Answer

The correct answer is C) r = -.50 because a negative correlation (r < 0) indicates that as one variable increases, the other decreases, which matches the described relationship between hours spent studying and mistakes made.

Quiz 13: Correlation

A recent study found that the more elementary students are involved in after-school activities, the less likely they are to get involved with gangs. Which of the following correlations reflects this relationship?

A survey of Psychology majors finds that the more "real world" experience students gained, the less likely they were to go to graduate school. Which of the following correlations reflects this relationship?

Which of these statistics best describes the relationship in this scatterplot?

A correlation of is BEST represented by .

A recent study found that the more money schools are given to provide after-school activities, the less likely their students are to get involved with illegal activities. Which of the following correlations reflects this relationship?

Which of these statistics BEST describes the relationship in this scatterplot?

Which of these statistics BEST describes the relationship in this scatterplot?

Which of these statistics BEST describes the relationship in this scatterplot?

An instructor finds that, in general, the more other instructors use Powerpoint presentations and web sites, the less often students attend class. Which of the following correlations reflects this relationship?

An instructor finds that, in general, the more time students spend on laptop computers during class, the less often students take notes. Which of the following correlations reflects this relationship?

Which of these statistics BEST describes the relationship in this scatterplot?

A Pearson correlation of is BEST represented by .

An instructor finds she is completely unable to predict student's performance in her class from her initial impression of them. Which of the following correlations BEST reflects the relationship between her impressions and their performance?

Which of these statistics best describes the relationship in this scatterplot?

A Pearson correlation of is BEST represented by .

Which of these statistics BEST describes the relationship in this scatterplot?

An instructor finds the more often students ask for help in office hour visits, the greater the improvement in their performance across the semester. Which of the following correlations BEST reflects this relationship between asking for help and course performance?

Which of these statistics BEST describes the relationship in this scatterplot?

A correlation of is BEST represented by .

A researcher finds that the more hours students spend studying, the fewer mistakes they make on their assignments. Which of these statistics BEST describes this relationship?