Ch.11 Correlation And Prediction,Regression

Question 1

2 types of Statistics

Answer 1

-Descriptive Statistics
-Inferential Statistics

Question 2

Types of Descriptive Statistics

Answer 2

-Mean
-Median
-Mode
-Range
-Variance (s²)
-Standard Deviation (2)
-Z-Scores

Question 3

Types of Inferential Statistics

Answer 3

-Hypothesis Testing
-Correlation
-Regression
-T-tests
-ANOVA, MANOVA

Question 4

A measure of linear association between two CONTINUOUS variables

Answer 4

Bivariate Correlation

Question 5

Types of Bivariate Correlation

Answer 5

●Pearson vs. Spearman Rho
●Strength
●Direction
●Shape of Relationship

Question 6

A numerical coefficient that indicates the extent to which two variables are related or associated

Answer 6

Pearson Correlation Coefficient

Question 7

T/F Pearson Product Moment Correlation is used to w/ ratio or interval data only

Answer 7

True

Question 8

Examples of Pearson correlation coefficient

Answer 8

Amount of practice and success,
Amount of water drank and hydration, amount of coffee drank and how much energy one has, calorie intake and weight

Question 9

Correlation: Strength; what does the coE(r) range from?

Answer 9

r ranges from -1.0 to +1.0

Question 10

Correlation: Direction (3)

Answer 10

No correlation: random association
Positive correlation: both variables are in same direction
Negative correlation: variable not in same direction

Question 11

Example of negative correlation/association

Answer 11

VO2 max and mile run time

Question 12

Example of positive correlation

Answer 12

The taller you are the longer your pants, less confidence and less likely to land a job

Question 13

Unit of measurement for r in a graph

Answer 13

Z-scores for x & y

Question 14

T/F Two things happening at the same time DOES imply cause and effect

Answer 14

False , not just because they happen at the same time

Question 15

●What is the effect of students’ off-task behavior on their academic achievement?
-Is this Inappropriately stated?

Answer 15

Yes

Question 16

●What is the influence of instructors’ assessment knowledge on the passage rates in their courses?
-Is this appropriately stated?

Answer 16

No

Question 17

●What is the association of students’ off-task behavior and their academic achievement?
-Is this inappropriately states?

Answer 17

Nope

Question 18

●What is the relationship between instructors’ assessment knowledge and the passage rates in their courses?
-Is this appropriately stated?

Answer 18

Yes

Question 19

Proportion of shared variance between the two measures & how well the one variable can be explained by the other variable

Answer 19

Coefficient of determination (r^2)

Question 20

For null regarding the correlation we check the ______ rather than difference

Answer 20

Association

Question 21

If P< .05 we _______ the null and agree that their is an association

Answer 21

Reject

Question 22

Relationship/Association

Answer 22

Correlation

Question 23

What are the two components of correlation

Answer 23

Strength & direction

Question 24

T/F Correlation can be above 1

Answer 24

False

Question 25

How do we determine the shared variance between two variables?

Answer 25

Square the correlation coefficient(r)

Question 26

What does shared variance tell you?

Answer 26

The percent change in one variable associated with one variable

Question 27

5 Correlation issues

Answer 27

Curvilinear or linear
Range restriction
Prediction
Error of prediction
Standard error of estimate

Question 28

Statistical method used to predict the criterion, outcome, or dependent variable (Y), from a single predictor or independent variable (X).

Answer 28

Linear Regression