MET 10 - Choice of test

Question 1

What is statistical testing?

Answer 1

• Provides a way of determining whether hypotheses should be accepted or rejected
• By using a statistical test, we can find out whether differences or relationships between variables are significant (meaningful) or are likely to have occurred by chance

Question 2

What is the sign test?

Answer 2

• A statistical test used to analyse the difference in scores between related items (e.g. the same participant tested twice)
• Data should be nominal or better. It is a non-parametric

Question 3

What are levels of measurement?

Answer 3

Quantitative data can be classified into types or levels of measurement, such as nominal, ordinal and interval

Question 4

What is spearman’s rho?

Answer 4

A test for a correlation when data is at least ordinal level

Question 5

What is pearson’s r?

Answer 5

A parametric test for a correlation when data is at interval level

Question 6

What is the wilcoxon test?

Answer 6

• A test for a difference between two sets of scores
• Data should be at least ordinal level using a related design (repeated measures)

Question 7

What is the mann-whitney test?

Answer 7

• A test for a difference between two sets of scores
• Data should be at least ordinal level using an unrelated design (independent groups)

Question 8

What is the related t-test?

Answer 8

• A parametric test for a difference between two sets of scores
• Data must be interval level with related design, i.e. repeated measures or matched pairs

Question 9

What is the unrelated t-test?

Answer 9

• A parametric test for a difference between two sets of scores
• Data must be interval level with an unrelated design i.e. independent groups

Question 10

What is the chi-squared test?

Answer 10

• A test for an association (difference or correlation) between two variables or conditions
• Data should be nominal level using an unrelated (independent) design

Question 11

What features should you consider when choosing a statistical test?

Answer 11

• The level of measure
• The experiment design
• If you are looking for differences or correlations
• We need to know what type of hypothesis you have to decide if you accept or reject a hypothesis

Question 12

What is Df? And when is it required?

Answer 12

• Degrees of freedom
• Only required for t-tests and chi-square test

Question 13

Draw the chart for deciding what statistical test to use.

Answer 13

Answer in MET 10 word doc