Simple experiment T-test ANOVA

Question 1

How many IV(s) does a simple experiment have?

Answer 1

ONE IV (often with two levels)

Question 2

when there are two levels, you can compare means using an __________

Answer 2

independent-groups t-test

Question 3

When there are more than 2 groups, you have to compare means using _________

Answer 3

Analysis of variance (ANOVA)

Question 4

when doing an independent samples t test what does the t value mean?

Answer 4

how big the difference is between group means in proportion to how big the differences between group means would be if you took samples from the same pop.

Question 5

Samples from same population will differ more when …….

Answer 5

when the variable has more variance and when the sample is smaller

Question 6

When groups are smaller what is needed in order to conclude that the group means differ more than you’d expect by chance?

Answer 6

Need a larger t

Question 7

When you have 3 or more groups on your IV what do you consider? (what question is an anova trying to answer)

Answer 7

variance between groups relative to variance within groups
- is the variance of group means bigger than you’d expect to find if the groups were all in the same condition

Question 8

ANOVA involves an __ test

Answer 8

F test- in which “F” is a ratio between variances

Question 9

if the F value is a lot bigger than 1……

Answer 9

then the variance in group means is probably bigger than you’d expect to find if the groups had all been sampled from the same population

Question 10

How high a F value is depends on……

Answer 10

sample size
with smaller groups (less df) need a larger F to make significant conclusions