Statistics and Research Design

Question 1

A developmental psychologist finds that low birthweight is associated with a higher risk for ADHD for boys but not for girls, In this situation, gender is a( n) :

Answer 1

Moderator Variable

Question 2

Moderator

Answer 2

A variable that affects the direction or strength of the relationship between two other variables.

Question 3

Mediator

Answer 3

A variable that explains the relationship between two other variables.

Question 4

A distribution of scores is ______ when it is more “peaked” than a normal distribution.

Answer 4

Leptokurtic

Question 5

Adding a constant to every score in a distribution of scores will:

Answer 5

Increase the distributions mean

Question 6

The ANCOVA enables and experimenter to:

Answer 6

Statistically remove error variance that is attributable to known extraneous variables

Question 7

When conducting a one-way ANOVA, the F-ratio is calculated by:

Answer 7

Dividing the mean square between by the mean square within