PSYC 310 Ch 6

Question 1

Indication of the strength of the relationship between two variables

Answer 1

Magnitude

Question 2

Figure that graphically represents the relationship between two variables

Answer 2

Scatterplot

Question 3

Direct relationship between two variables; as one variable increases, so does the other

Answer 3

Positive Relationship

Question 4

Increase in one variable is accompanied by a decrease in the other

Answer 4

Negative Relationship

Question 5

Assumption that a correlation indicates a causal relationship between two variables

Answer 5

Causality

Question 6

Inference made with respect to the direction of a causal relationship between two variables

Answer 6

Directionality

Question 7

Problem of a correlation between two variables being dependent on another (third) variable

Answer 7

Third-variable Problem

Question 8

Correlational technique that involves measuring three variables and then statistically removing the effect of the third variable from the correlation of the remaining two variables

Answer 8

Partial Correlation

Question 9

Variable that is truncated and has limited variability

Answer 9

Restrictive Range

Question 10

Arguing that a well-established statistical trend is invalid because we know a “person who” went against the trend

Answer 10

Person-Who Argument

Question 11

Most commonly used correlation coefficient when both variables are measured on an interval or ratio scale

Answer 11

Pearson Product-Moment Correlation Coefficient (Pearson’s r)

Question 12

Measure of the proportion of the variance in one variable that is accounted for by another variable; calculated by squaring the correlation coefficient

Answer 12

Coefficient of Determination (r-squared)

Question 13

Correlation coefficient used when one (or more) of the variables is measured on an ordinal (ranking) scale

Answer 13

Spearman’s Rank-Order Correlation Coefficient

Question 14

Correlation coefficient used when one of the variables is measured on a dichotomous nominal scale and the other is measured on an interval or ratio scale

Answer 14

Point-Biserial Correlation Coefficient

Question 15

Correlation coefficient used when both measured variables are dichotomous and nominal

Answer 15

Phi Coefficient

Question 16

Procedure that allows us to predict an individual’s score on one variable based on knowing one or more other variables

Answer 16

Regression Analysis

Question 17

Best-fitting straight line drawn through the center of a scatterplot that indicates the relationship between the variables

Answer 17

Regression Line

Question 17

Both variables must be interval or ratio

Answer 17

Pearson

Question 18

Both variables are ordinal (ranked)

Answer 18

Spearman

Question 19

One variable is interval or ratio, one is nominal and dichotomous

Answer 19

Point- Biserial

Question 20

Both variables are nominal and dichotomous

Answer 20

Phi