Correlation Flashcards
(10 cards)
1
Q
Both variables have to be continuous. T or F?
A
True
2
Q
Interpret this:
r(10)=.667, p=.018
A
r: inferential statistic
10: degrees of freedom (df); # of pairs-2
.667: r value
.018: p value
3
Q
Example of positive relationships?
A
As x increases, so does y
Ex: as education increases, so does earnings
4
Q
Example of negative relationships?
A
Inverse; as x goes up, y goes down
Ex: as self esteem goes up, depression goes down
5
Q
What describes a relationship?
A
- direction (positive or negative)
- strength (strong or weak)
- shape (linear or non linear)
6
Q
Correlation=causation. T or F?
A
False; it inly suggests relationships
- need more info to determine causality
- cause and effect can be indirect die to confounding variables
7
Q
Exakples of continuous variables tested together?
A
- IQ and yrs. of schooling
- height and weight
- # of days at gym per week and BMI
- depression and anxiety score
- # of children under age 18 in a family and annual family income
8
Q
What’s the null hypothesis?
A
There is no linear relationship between the 2 variables
9
Q
Reject the null hypothesis?
A
The 2 variables are related
10
Q
Fail to reject the null hypothesis?
A
The 2 variables aren’t related
