29 Anova

Question 1

based on the standard error of diff between 2 means

Answer 1

t test

Question 2

what is bonferroni adjustment?

Answer 2

divide alpha by no. of comparisons (decreases significance level)

Question 3

what does anova stand for?

Answer 3

analysis of variance

Question 4

anova used for:

Answer 4

test hypotheses about diffs between 3+ means (adjust internally for multiple tests)

Question 5

variables happen:

Answer 5

between subject and within subject

Question 6

test to supplement anova?

Answer 6

post-hoc significance tests

Question 7

prob of post hoc?

Answer 7

> chance produce type 1

Question 8

what is EER?

Answer 8

experimentwise error rate (probability that at least one test will give type 1 error)

Question 9

control of EER and power of significance tests is ___ related

Answer 9

inversely

Question 10

3 conflicting goals of choosing post hoc:

Answer 10

1) extract all info from data that is meaningful 2) control EER 3) achieve high lvl power

Question 11

types of post hoc?

Answer 11

Fisher’s LSD, Tukey’s HSD, S-N-K, Duncan, Bonferroni, Scheffe, Dunnett

Question 12

least conservative test?

Answer 12

Fisher’s LSD

Question 13

most conservative ?

Answer 13

Scheffe

Question 14

this type compares each group/treatment to control

Answer 14

Dunnett

Question 15

how do LSD, HSD, Duncan’s and SNK differ?

Answer 15

tcrit value (same formula for computing t)

Question 16

most researchers believe that _____ proceduures result in too high EER

Answer 16

Duncan’s and Fishers

Question 17

which has more power, Tukey or SNK?

Answer 17

SNK

Question 18

when have 2+ independent variables use :

Answer 18

two way anova (factorial analysis)

Question 19

two way can test for ____

Answer 19

main effects and interactions

Question 20

what are main effects?

Answer 20

tests of independent variables alone on one dependent variable

Question 21

what are interactions?

Answer 21

test of interactions tween variables