Week 6 Flashcards
1
Q
What does a t-test measure?
A
The difference between means is significant or not.
2
Q
What are parametric statistics calculated from?
A
Data - mean and SD.
3
Q
What are non-parametric statistics calculated from?
A
From ranked scores.
4
Q
Three assumptions for parametric:
A
- interval or ratio
- normally distributed
- variance has to be similar if there are two groups.
5
Q
What is:
nominal
ordinal
interval
ratio
A
Nominal - names and catagories
ordinal - order or rank
interval - equal distance between each number
ratio - same as interval but not below 0 (true 0).
6
Q
What is normality testing?
A
Tests if results come from a normally distributed population.
7
Q
What is the ceiling and floor effect?
A
Ceiling - task is too easy
Floor - task is too hard
8
Q
Homogeneity of varients
A
Similar variants.
9
Q
Heterogenerity of variance
A
Different variance
