0.19. Inferential Statistics

Question 1

What level of significance should be used?

Answer 1

0.05 level of significance unless the question tells you otherwise

Question 2

What does 0.05 mean?

Answer 2

5% occurred by chance (extraneous variables are not controlled)
You are 95% sure the IV manipulation (conditions) caused by the DV effect (measurement)

Question 3

What is nominal data?

Answer 3

Data from categories i.e. smoker 300, non smoker 750

Question 4

What is ordinal data?

Answer 4

Data ordered i.e. smallest to largest
It is subjective
I.e. how happy you are today/ how well you slept 1-7

Question 5

What is interval data?

Answer 5

Equal units increments between each unit (time, distance, temp)

Question 6

How do you choose a test?

Answer 6

• Is it a test of difference or relationship/ correlation/ association
• What is the level of measurements (data) -> nominal, ordinal or interval
• What is the experimental design (how are ppts used -> independent or repeated)