CHP. 8 - Bivariate Correlation

Question 1

Bivariate Correlation

Answer 1

Correlation between exactly 2 variables

Question 2

Effect Size Strengths

Answer 2

r = +/- 0.10: small or weak
r = +/- 0.3: medium or moderate
r = +/- 0.5: large or strong

Question 3

T-test

Answer 3

Statistical test to determine if there is a significant difference between 2 groups

Question 4

Effect Size

Answer 4

Describes the strength of the association
- how well does 1 variable predict the other?
- larger effect values give more accurate predictions

Question 5

P Value

Answer 5

Probability estimate

Question 6

Type 1 vs Type 2 Errors

Answer 6

Type 1: false positive (false alarm)
Type 2: false negative (miss)

Question 7

Outliers

Answer 7

Extreme scores outside of a normal distribution
- matter most with small sample

Question 8

Curvilinear Association

Answer 8

Association that isn’t a straight line & r is close to 0

Question 9

Moderator

Answer 9

When a relationship between 2 variables changes depending on the level of another variable
- shift in the bivariate relationship
- often a (+) to (-) trend or vice versa
- also could be signficant to N.S. or vice versa