3.5 Choosing a stats test

Question 1

Define what a statistical test is

Answer 1

Used to determine whether a significant difference exists - whether to accept or reject null hypothesis.

Question 2

Define what levels of measurement are.

Answer 2

Quantitative data can be classified into nominal, ordinal and interval.

Question 3

What is nominal data?

Answer 3

Categorical.

Discrete - only 1 item in each category

Question 4

What is ordinal data?

Answer 4

Ranked.

Question 5

What is interval data?

Answer 5

Equal intervals.

Question 6

What is the Chi-Squared test?

Answer 6

Tests for correlation between two variables or conditions. Data should be nominal using an unrelated IG design.

Question 7

What is the Mann-Whitney test?

Answer 7

Tests for significant difference between two sets of scores. Data is ordinal using unrelated RM

Question 8

What is the Wilcoxin test.

Answer 8

Tests for significant difference between two sets of scores. Data is ordinal using related RM

Question 9

What is the spearmen’s rho test.

Answer 9

Tests for correlation when data is ordinal.

Question 10

What is the Pearson’s R test.

Answer 10

Parametric test for correlation in interval data.

Question 11

What is the related t-test

Answer 11

Parametric test for difference between two sets of scores. Data is interval with a related design, e.g. RM or matched pairs.

Question 12

What is the unrelated t-test.

Answer 12

Parametric test for difference between 2 sets of scores. Data is interval with unrelated design i.e. independent groups