Chapter 15 - Correlation

Question 1

Correlation

Answer 1

• relationship between two variables

Question 2

X

Answer 2

• predictor variable

Question 3

Y

Answer 3

• criterion variable

Question 4

Homoscedasticity

Answer 4

• spread of data around the regression line should be even across the range

Question 5

r

Answer 5

• measure of the degrees or strength of the relationship between variables
• -1 to 1

Question 6

r interpretation

Answer 6

• direction = + or - relationship
• degree = strong or weak relationship

Question 7

Scatterplot

Answer 7

• diagram used to plot the relationship between two variables

Question 8

Regression line

Answer 8

• represents a line drawn through the data points on a scatterplot
• linear relationship

Question 9

Pearson’s r

Answer 9

• used for 2 continuous variables

Question 10

Coefficient of determination (r2)

Answer 10

• proportion of variability explained by the relationship

Question 11

Covariance

Answer 11

• represents the degree to which 2 variables vary together

Question 12

Correlation coefficient (pearson’s r)

Answer 12

• standardized (raw to z score) covariance

Question 13

df

Answer 13

• n-2
• n = pairs of observation