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Psychology A2 - Research Methods > A2 statistical tests > Flashcards

Flashcards in A2 statistical tests Deck (12)
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1

Describe a Mann-Whitney U Test

- Test of difference
- Used with ordinal, interval or ratio data
- Used with an independent groups design
- Observed value should be equal to or less than the critical value to reject the null hypothesis

2

Using a Mann-Whitney U test, how would you know you could reject the null hypothesis

Observed value should be equal to or less than the critical value

3

What test can be used on Independent groups (potentially a second also...)

Mann-Whitney U
Chi Squared

4

Which 3 of the 4 tests can be used on interval, ordinal or ratio data?

Mann-Whitney U
Wilcoxin T
Spearman's Rank Order Correlation

5

Which test is for use on nominal data?

Chi Squared

6

Describe the Wilcoxin T test

- Test of difference
- The data should be ordinal, interval or ratio
- It is used with a repeated measures design or a matched pairs
- Observed value should be equal to or less than the critical value to reject the null hypothesis

7

Using a Wilcoxin T test, how can we reject our null hypothesis?

The observed value should be equal to or less than the critical value in order to reject the null hypothesis

8

Describe a Chi Squared test

- This is a test of association (difference) when data is nominal
- It cannot be used with data or averages
- The data must be independent - something recorded in one category cannot be recorded in another
- Used on nominal data
- Observed value should be greater than the critical value to reject the null hypothesis

9

How can we reject a null hypothesis using a Chi Squared test?

The observed value must be greater than the critical value to reject the null hypothesis

10

Describe the Spearman's Rank Order Correlation

- Used when testing for correlation with pairs of scores
- The data should be ordinal, interval or ratio
- The test gives a correlation coefficient with a value between +1.00 and -1.00
- The sign indicates the direction of the relationship (positive or negative)
- The number indicates the strength of correlation
- Observed value should be equal to or more than the critical value to reject the null hypothesis

11

How can we reject a null hypothesis using a Spearman's Rank order Correlation test?

The observed value must be more than or equal to the critical value to reject the null hypothesis

12

When understanding how to interpret results of a statistical test by using a table of critical values, what si it important to know?

It is a one tailed test for a directional hypothesis
Two tailed test for a non-directional hypothesis