Correlation and regression

Question 1

What does correlation find?

Answer 1

line of best fit

Question 2

How does correlation find line of best fit?

Answer 2

by minimising differences (residuals) between the data and the line

Question 3

If r is above zero the correlation is…

Answer 3

positive

Question 4

If r is below zero the correlation is…

Answer 4

negative

Question 5

If r is closer to 1 or -1 the correlation is…

Answer 5

strong

Question 6

If r is closer to 0 the correlation is…

Answer 6

weak

Question 7

If r^2 is close to 1, the correlation explains…

Answer 7

a lot of variance

Question 8

If r^2 is close to 0, the correlation explains…

Answer 8

only a little variance

Question 9

r^2 is also known as?

Answer 9

Co-efficient of determination

Question 10

Correlation or regression?
Describes multiple relationships?

Answer 10

Regression

Question 11

Correlation or regression?
Describes single relationship?

Answer 11

correlation

Question 12

Correlation or regression?
Describes directions of relationships?

Answer 12

Regression

Question 13

Correlation or regression?
x and y are interchangeable

Answer 13

correlation

Question 14

Correlation or regression?
Allows prediction

Answer 14

regression

Question 15

How many independent variables does simple linear regression have?

Answer 15

One

Question 16

How many independent variables does multiple linear regression have?

Answer 16

two

Question 17

What do multiple predictor variables find in multiple regression?

Answer 17

the best fitting surface with relation to residuals

Question 18

What can cause problems in correlation and regression?

Answer 18

Non-linear relationships

Question 19

Which predictors do correlation and regression deal with?

Answer 19

categorical, ordinal and non-linear