PSY 305 Page 1 of 1
Statistics Review Sheet
Review for Exam 2 (Chapters 5, 6, 7)
Chapter 5
Key terms
Raw score
Deviation score
Standardized distribution
Standardized score
z-score
z-score transformation
Know how to transform X values into z-scores, and z-scores into X values.
Know how to calculate the standard deviation based on z-scores, x-value, and mean
Know how to calculate the mean based on z-scores, x-value, and standard deviation.
Understand and describe the effects of standardizing a distribution by transforming the
entire set of X values into z-scores (e.g., what happens to the shape, the mean, and
the standard deviation?)
Be able to use z-scores to transform any distribution into a standardized distribution with
a predetermined mean and a predetermined standard deviation
Chapter 6
Key terms
Probability
Simple random sample
Sampling with replacement
Unit normal table
Be able to use the unit normal table to find probabilities for specific scores in a normal
distribution and to find the scores that correspond to specific proportions of a
normal distribution
Chapter 7
Key terms
Sampling error
Sampling distribution
Expected value of M
Law of large numbers
Distribution of sample means
Central limit theorem
Standard error of M
Be able to determine the probabilities corresponding to specific sample means using the
distribution of sample means, z-scores, and the unit normal table