Studied by 1 person

0.0(0)

Get a hint

Hint

1

Explanatory Variable

attempts to explain the observed outcomes

New cards

2

Response variable

measures the outcome of the study

New cards

3

Scatterplot

shows the relationship between two quantitative variables measured on the same individuals

New cards

4

Form of a scatterplot

linear or curved

New cards

5

Direction of a scatterplot

is positive, negative, or neither

New cards

6

Strength of a scatterplot

is weak, moderate, or strong

New cards

7

Outlier

lies outside the overall pattern

New cards

8

Positively associated

as one increased the other increases

New cards

9

Negatively associated

as one increases the other decreases

New cards

10

Coorelation

mesures the strength and direction of the relationship between 2 quantitative variables; represented by r

New cards

11

Facts on correlation

r does not change if x and/or y are changed

positive r = positive association and negative r = negative association

always a number between -1 and +1

measures strength of a linear relationship

is nonresistant

New cards

12

regression line

describes how a response variable y changes as explanatory variable x changes; predicts values of y for given values of x

New cards

13

R-squared

percentage of the change in the y-variable that can be attributed to its relationship with the x-variable

New cards

14

Residual

difference between observed value of y and a value predicted by the regression line; residual = actual y - predicted y

New cards

15

Residual plot

scatter plot of each x-value and its residual value

New cards

16

Influential point

the removal of the point has a large effect on the correlation and / or regression

New cards