Independent t Tests Flashcards
1
Q
When are they used
A
Between subjects design
Where parametric subjects are met
2
Q
What parametric assumptions need to be met?
A
- DV is interval or ratio
- IV is categorical
- Normal distribution of DV on each level of IV
- Homogeneity of variance
- No outliers
3
Q
Homogeneity of variance -
What test?
Probability?
A
Levene’s test
P > .05 is good - variance doesn’t differ across groups
4
Q
What 3 things does the t test take into account?
A
- Size of sample (bigger = better)
- How great the difference is between the 2 means you are comparing
- The standard deviations of the data within your 2 samples
5
Q
What are the parameters for ‘t’
A
Mean
Standard deviation
6
Q
When should an independent samples t test be used
A
Comparing means for 2 groups
7
Q
What is the total degrees of freedom
A
No. Data points - no. Groups
8
Q
Standard APA format
A
t (degrees of freedom) = value of t, p =
9
Q
Presenting the results
A
(M = , SD = ) twice cos comparing the results then
t ( ) = , p = , two/ one tailed
10
Q
What does a t test do?
A
Assesses whether the means of 2 groups are statistically different from eachother
