saptamana unspe

Question 1

What is unrelated t-test?

Answer 1

Looks at the difference between 2 conditions or groups

Question 2

When do you use unrelated t-test?

Answer 2

Interval data
Design is between groups

Question 3

What are the assumptions of the unrelated t-test?

Answer 3

Interval data - DV has to be on a scale
Data from normally distributed population
Homogeneity of variance
Robust test - some leeway in assumptions

Question 4

What is the non-parametric alternative ?

Answer 4

Mann- Whiteny U

Question 5

What is homogeneity of variance?

Answer 5

The variance of groups should not be significantly different

Need to be checked when:
- unrelated design
- sizes of groups are different

See if differences are due to IV and not based on the fact that there is distinct people

Question 6

What is the test for homogeneity of variance?

Answer 6

Levene’s test

Question 7

What is Levene’s test?

Answer 7

Whether or not you have met homogeneity assumption
Assumption is met if Levene’s test is not significant - the 2 groups are similar

If Levene not significant - report line for equal variance assumed
If Levene significant - report 2nd line

Question 8

What do we report for unrelated t-test?

Answer 8

T value, degrees of freedom and significance level

t(df) = t value, p = significance level