Exam 3 Review - Chapter 11 Flashcards
1
Q
What is an independent samples t test?
A
A t test used to compare two groups when the scores between them are independent of each other.
2
Q
When should independent samples t tests be used?
A
two samples with different participants/data is not correlated
3
Q
How to calculate independent samples t statistic
A
(Mx - My) - (Mew x - Mew y)*/s difference
- usually equals zero
4
Q
How to find s difference?
A
- subtract mean from samples, square and sum
- divide by degrees of freedom
- (dfx/dftotal) sum x + (dfy/dftotal) sum y
- divide by sample size
- add the two values
5
Q
What assumption is exclusive to independent sample t tests?
A
Homogeneity of variance
6
Q
What does the 95% confidence interval focus around in terms of independent samples t tests?
A
Difference between means
7
Q
How do you find the confidence interval for an independent samples t test?
A
-/+ t(s difference) + (Mx - My)Sample
8
Q
Cohen’s d for independent sample t tests
A
(Mx - My) / S pooled
9
Q
How to find s pooled?
A
- subtract from mean
- square
- add
- divide by degrees of freedom
