Quant: Lecture 6

Question 1

What is the purpose of an unrelated t test?

Answer 1

It is also called an independent samples t test and it’s used to test for differences between two conditions with different participants in each.

Question 2

How do you calculate an unrelated t test?

Answer 2

First, you total all of the scores for condition one and square the total to get (Ex)2. Then you find the mean for condition 1. After this, you square all of the values in condition one and add up all of these scores to get Ex2. Now do the same with condition 2. Finally, put the values into the formula.

Question 3

How do you work out the degrees of freedom for an unrelated t test?

Answer 3

N1+N2-2.

N1= N for condition 1

Question 4

What do degrees of freedom determine?

Answer 4

It determines the number of scores that are independent and free to vary.

Question 5

How do you word your answer for an unrelated t test?

Answer 5

For a tailed test, with df, the calculated t value () was *er than the critical value () at a significance level of pt a significant difference.

Question 6

If there is a large cohen’s d and a significance level of p>0.05?
Or a small cohen’s d and p0.05?
Small, p

Answer 6

You have an effect
No effect
Low power probably because the sample was too small
Small effect.