ANOVA TESTS

Question 1

Define an indepdent t-test?

Answer 1

Parametric test for a between subject design

Question 2

Define paired samples t-test?

Answer 2

Parametric test for a within subject design

Question 3

Define the Mann-Whitney u test?

Answer 3

Non-parametric test for a between subject design

Question 4

Define the wilcoxon test?

Answer 4

Non-parametric test for a within subject design

Question 5

Whats an example of a research questions where we would want three or more conditions?

Answer 5

Sluckin et al

Question 6

Explain sluckin et Al’s study?

Answer 6

Relationship between liking and familiarity is best described as an inverted u
- manipulation don’t always have linear effects
- if we only had two conditions we would draw incorrect conclusions about the phenomenon

Question 7

What increases when we use multiple t-tests?

Answer 7

Type 1 errors which are false positives

• since each test has a 1/20 probability of getting a significant result when there isn’t one

If you conduct several tests on a single dataset, it increases the likelihood of hitting the 1/20 chance

Question 8

What happens when you have 4 conditions?

Answer 8

U need to conduct 6 tests

Question 9

What happens when theres 4 conditions?

Answer 9

You need to conduct 6 t-tests

Question 10

Whats the chances of having at least one type of 1 error for when the conditions are 4?

Answer 10

20%

Question 11

Give an example of a study with multiple conditions?

Answer 11

The dead fish study by bennet et al

Question 12

Explain the dead fish study by bennet et al?

Answer 12

FMRI study where participants were required to undergo a persepective task - see a photo of different social situations and determine the emtions of the individual in the photo

Question 13

Whats the analyse of the dead fish study?

Answer 13

The brain was divided inot voxels and t-tests were run that compared activation when viewing photos verses rest

• a lot of t-tests were run

Question 14

What was the brains activity like in the dead fish study?

Answer 14

Significant increase in activatoion observed within some areas of the salmons brain cavity when viewing photos compared to rest

Question 15

What does anova do?

Answer 15

Examines differences between three or more levels of an indepdent variable

More specifically it tests the null hypothesis that the populations from which the samples have been drawn have equal means

Question 16

Examples of when to use one way anova?

Answer 16

• comparing blood oxygen levels between three groups = smokers, people who never smocked and former smokers
• comparing scores on a spelling test between children who attend five different schools

Question 17

List the criteria of using one -way anova?

Answer 17

• examining three or more levels of an indepdent variable
• data is interval or ratio
• study is between subject

Question 18

Explain about the only using one way anova when it’s examining a difference between three or more levels of an indepdent variable?

Answer 18

Levels of the independent variable are the different values of the indepdent variable v