Choosing a statistical test Flashcards
1
Q
Why is a statistical test used?
A
- to determine whether a significant difference or correlation exists and whether the null hypothesis should be rejected or accepted)
(can’t accept alternative >never 100%, can reject though)
2
Q
What are the three factors used to decide a statistical tests?
A
- whether a research is looking for a difference or correlation
- in a case of difference, what experimental design is being used
- the level of measurement
3
Q
What is the first decision that needs to made when choosing a statistical test?
A
- is the researcher looking for a difference (one tailed or two tailed) between two groups
- or correlation (relationship, association)
4
Q
What is the second decision that needs to made when choosing a statistical test?
A
- What is the experimental design
- Matched pairs and repeated measures = related > p’s are the same or similar
- independent groups = unrelated > p’s are different
- choose from unrelated or related
5
Q
Recite table of statistical test
A
6
Q
What is the mnemonic to remember statistical test table?
A
Carrots should come mashed with salt under roast potatoes
7
Q
What is the third decision that needs to be made when choosing a statistical test?
A
- quantitative data divided into different levels of measurement
- nominal, ordinal and interval
8
Q
What are the characteristics of nominal data?
A
- no natural order
- categorical data
- discrete, item can only appear in one of the categories
- can be subjective
- can be quantitative or qualitative
e.g. sex, eye colour, favourite team
9
Q
What are the characteristics of ordinal data?
A
- has a natural order
- difference between values are not meaningful
- subjective
- can be qualitative or quantitative
e.g. rating scale, rank, shoe size
10
Q
What are the characteristics of interval data?
A
- has a natural order
- difference between two values is meaningful
- most scientific > objective
- quantitative only
e.g. weight, temperature, time
11
Q
A
