Ch4: The Statistical Significance of F and Effect Strength”

Question 1

F

Answer 1

Variance Ratio

Question 2

alpha level or statistical significance level

Answer 2

the provability level at the boundary separating remarkable from unremarkable region

Question 3

Type 1 Error (False positive)

Answer 3

when we are wrong in rejecting the null hypothesis

Question 4

Type 2 Error (False negative)

Answer 4

fail to reject the null hypothesis and claim instead that the means are not significantly significant

Question 5

Strength (or magnitude) of effect measures

Answer 5

indexes of how strongly the scores and the levels of the independent variable are related to each other

Question 6

Omega squared

Answer 6

the strength of the effect of the independent variable in the population

Question 7

Eta squared (η2) known as R2

Answer 7

directly intepreted as the proportion of total variance of the dependent vaiable that is accounted for or explained by (or associated with) the independent variable in the sample data set

Question 8

Eta

Answer 8

correlation cofficient

Question 9

η2

Answer 9

SSA / SS Total

Question 10

Cohen’s d

Answer 10

the mean difference can be judged relative to the standard deviations of the groups
d = Y1 bar - Y2 bar / SD

Question 11

statitical power

Answer 11

more power corresponds to a greater ability to detect a true effect. Driven by three factors: alpha level, effect size in the population, and sample size

Question 12

effect size

Answer 12

the mean difference of the groups in the population evaluated against the within-groups population variance