PSY 305 Page 1 of 2
Statistics Review Sheet
Review for Exam 3 (Chapters 8, 9, 10, 11)
Chapter 8
Key terms
Null hypothesis
Alternative hypothesis
Type I error
Type II error
Alpha level
Critical region
Level of significance
Statistically significant
Understand the logic of hypothesis testing
Be able to state the hypotheses and locate the critical region
Be able to conduct a hypothesis test using a z-score statistic and make a statistical
decision
Be able to define and differentiate between Type I and Type II errors
Be able to compute Cohen’s d and understand the purpose of measuring effect size and
Power
Conduct a one-tailed (directional) test and state a directional hypothesis
Chapter 9
Key terms
Estimated standard error
t statistic
degrees of freedom
percentage of variance accounted for (r2)
Understand when a t statistic is used (instead of a z-score) for hypothesis testing)
Perform a hypothesis test using the t statistic.
Be able to compute sample means and variance and estimated error for sample
mean
Be able to compute Cohen’s d and percentage of variance accounted for to measure effect
size
Chapter 10
Key terms
Independent-measures research design
Between-subject research design
Pooled variance
Homogeneity of variance
Understand the structure of a research study that produces data appropriate for an
