# W5 - T-tests Flashcards

1
Q

What are the assumptions of a paired t-test

A

Data is continuous/scale (interval or ratio)

Differences are normally distributed

No significant outliers in the ‘differences’

2
Q

What is the degrees of freedom?

A

No. of observations that are free to vary in any calculation of the mean.

3
Q

What is the degrees of freedom for a paired t-test

A

(n-1)

4
Q

What is the degrees of freedom for an independent t-test

A

(n-2)

5
Q

What happens if our t-statistic (i.e 5.417) is further away from 0 than the critical ‘t’ value (i.e 2.262)?

A

We REJECT the null hypothesis

6
Q

What are the assumptions of an independent t-test

A

Data is on a continuous scale + normally distributed

Normality of DV in each group.

Homogeneity of variance

7
Q

What does the levene’s test tell you?

A

Tests the null hypothesis in questioning whether the population variances are equal = homogeneity of variance

8
Q

What can squaring the SD from the SPSS output give you?

A

SD^2 = variance