lesson 12 - Infrential Analysis

Question 1

Questions to ask to choose the correct statistical test

Answer 1

Is it a test of difference, a correlation or an association?
2) What design have I used? Independent measures or repeated measures/matched participants design?
3) What level of measurement have I used? Nominal, ordinal, interval, ratio?
4) parametric or non parametric

Question 2

How do you know is pearsons r and T tests are significant

Answer 2

Related T test - Calculated value must be greater than or equal to the critical value
Unrelated T test - Calculated value must be greater than or equal to the critical value
Pearsons r - Calculated value must be greater than or equal to the critical value

Question 3

When do you use a related T test

Answer 3

This is used when we wish to test a difference
• The design is repeated measures
The data should be interval
• Related t-test is a parametric test

Question 4

What does N - 1 mean

Answer 4

Number of pps minus 1

Question 5

When do you use an unrelated T test

Answer 5

This test is used when we are looking for a test of difference
This statistical test is used when we have an independent group design.
This test has level of measurement which is interval.
T unrelated t-test is a parametric test

Question 6

When do we use pearsons r

Answer 6

This test is used for investigating correlations or relationships between variables
The level of measurement for the data is interval
Pearson’s r is a parametric test