Week 9 - Unrelated T test

Question 1

When is this test used?

Answer 1

Continuous Data

N>1

Compare central tendency

Unrelated samples

Both normal and variances equal - YES

Question 2

Normality check?

Answer 2

Yes - on both samples individually

Question 3

Outlier check?

Answer 3

Yes - on each group of data separately

Question 4

Variance check?

Answer 4

Yes - both the variances and normality of each group must be equal to the others’ variance/normality

Question 5

Where should the pooled variance fall?

Answer 5

In between the variance for each group - and it should be closer to the group with the larger sample size

Question 6

What do you do if the N for the two groups is different?

Answer 6

Pooled variance estimate: uses a different equation

The larger sample should contribute proportionally more the the calculation of standard error