Number of decimal places for reporting r-values and F-ratios.
What is two?
100
Personal characteristics that can differ from one participant to another. Can be the source of assignment bias.
What are individual differences?
100
Another name for within-subject design.
What is repeated-measures design?
100
Scores are obtained from two groups of participants
What is a between-subjects design?
200
SD
What is the standard deviation?
200
The type of score which expresses the difference of a score from the mean in units of standard deviation.
What is a z-score
200
A type of random assignment in which limitations result in equal group size.
What is restricted random assignment?
200
An advantage of removing individual differences found in between-subjects design.
What is increased power to detect an effect?
200
You follow the same cohort of students for 30 years.
What is a longitudinal design?
300
CI
What is confidence interval?
300
Cohen's d is an expression of this important measure of magnitude of changes resulting from a treatment.
What is the effect size?
300
A threat to the internal validity of a between-subjects design occurring when more people leave one group than another.
What is differential attrition?
300
Changes in behavior caused by lingering effects of a previous treatment.
What are order (including carryover) effects?
300
This design requires a series of observations for each participant before and after a treatment or event.
What is a time-series design?
400
df
What are degrees of freedom?
400
A graph of ordinal or ratio data in which adjacent, touching, vertical bars express the frequency for that category.
What is a histogram?
400
An extraneous variable which varies systematically with the IV, complicating assertions regarding causality.
What is a confounding variable?
400
A process for changing the order in which treatments are administered from one participant to another.
What is counterbalancing?
400
You measure computer literacy of 20, 30, 40, and 50 year olds at one time.
What is a cross-sectional developmental design?
500
ANOVA
What is Analysis of Variance?"
500
The category of effect size associated with an r value of .78
What is a large effect?
500
Type of groups which exist when each has been created and treated equally, and composed of equivalent individuals.
What are equivalent groups?
500
A within subjects design in which individuals in groups are selected and assigned based on a variable that is relevant to the research and may otherwise become a confounding variable.