Chapter 3 test review Flashcards
1
Q
Explanatory vairable
A
what is manipulated or you look for a change in
2
Q
Response variable
A
the variable that’s outcome depends on the manipulation of the explanatory variable.
3
Q
r
A
correlation coefficient: only measures quantitative variables, between 1 and -1, closer to one the stronger the correlation
4
Q
Does a least squares regression line mean that the data is linear?
A
no, it is just a correlation between points
5
Q
residual plot
A
the less correlation and pattern between points - more linear
observed - expected values, some negative, some positive
6
Q
least square regression lines
A
7
Q
regression line
A
line of best fit-prediction equation describes how a response variable y changes as an explanatory variable x changes
