Module #8 - Readings

Question 1

What is….?

"A systematic relationship
between two variables in
which a change in one
implies a corresponding
change in the other"

Answer 1

Covariance

Question 2

What is: A statistic summarizing the strength of association
between two metric
variables?

Answer 2

Product Moment Correlation or r

Question 3

“Correlation” is a special case of what?

Answer 3

Covariance

Question 4

What does r-squared measure?

Answer 4

The proportion of variation in one variable that is explained by the other.

Question 5

Does an R-squared equal to 0 mean there is no relationship between the variables?

Answer 5

No, it just means there’s no linear relationship. There could be a non-linear relationship.

Question 6

What effect does using scale data (e.g., 5 point agreement) have on r values?

Answer 6

It flattens them/ makes the r values smaller than the true “rho” values.

Question 7

What is: 
A measure of the
association between two
variables after controlling 
or adjusting for the effects
of one or more additional
variables.

Answer 7

Partial correlation coefficient

Question 8

What type(s) of variables are needed for ANOVA?

Answer 8

An independent categorical variable and a dependent metric variable.

Question 9

What does it mean to say an ANOVA is an n-way ANOVA?

Answer 9

It means there are “n” categorical independent variables.