12-Estimating the Difference Between the Means of Dependent Populations

Question 1

What is D, mD and s2D?

Answer 1

a difference score ,mean of the difference score and variance of the difference

Question 2

What is subject variability ?

Answer 2

the variability of individuals’ scores around the group mean.

Question 3

What is the formula for smd

Answer 3

smd=sqart of sd2/n

Question 4

What is the formula for The mean of the population of difference score ?

Answer 4

ud= SD/N

Question 5

What is the formula for the variance of the sample difference scores?

Answer 5

s2d= 2(s2b+s2a - 2ss2)

Question 6

What is a repeated-measures design?

Answer 6

involves scores obtained from participants on more than one occasion. That is, we’ve taken repeated measures from the same participants.

Question 7

What is the carryover effect?

Answer 7

occurs when obtaining measurements on previous trials affect the measurements made on subsequent trials.

Question 8

What is a matched-samples design?

Answer 8

creates dependent samples without measuring individuals twice. Individuals in two samples are matched on features that might be associated with the dependent variable, such as age, sex, socioeconomic status, IQ, health status, income, height, weight, or empathy, to name just a few that might be important in psychological research.