Answers to Z-scores vs. Z-Tests Practice Problems
1. Comparing an Individuals score to a Distribution of Individual: Compute a Zscore
a. Z = (85-100)/15 = -1.00
b. % associated with a Z of -1.00 is 34
Answers to Statistics Practice Problems for Exam #4
Question 1
a. There is a significant strong, positive relationship between number of subordinates and job stress, r (4) = +.90,
p < .02. As number o
Statistics Final Exam Practice Problems: CHOOSING STATISTICS
Fall 2012
a. What inferential statistical test should be used? If possible, state the critical value(s).
b. What additional statistics migh
ANSWERS FOR
Additional Practice with
Z tests, Decision Error, Effect Size, and Power
A pegboard task requires that subjects place small metal pegs into a board with holes arranged in
rows. Normative d
Statistics Practice Problems for Exam #4
1. A researcher wanted to identify variables that help predict stress among program directors. In this study,
he explored the possibility that the number of pe
Statistics Practice Problems for Final Exam: COMPUTATIONS
Fall 2012
a. What statistical test would you compute? Justify your choice.
b. Compute it by hand, including any follow-up tests.
c. Write an a
Final Exam Review: Brief Outline of Statistics Topics
Fall 2012
Measurement Scales
Nominal, Ordinal, Interval, Ratio
Descriptive Stats
Measures of Central Tendency
Measures of Variability
z-scores (Ra
Practice Exam #3
A researcher conducted an experiment on memory for poems in which participants were randomly
assigned to either receive or not receive memory cues and either were or were not given a
ANSWER KEY to Exam #3 Practice Problems
1. There are several reasons for this choice. One is that analyzing the effect of both IVs in one study
helps to reduce the cumulative Type I error. A second re
Statistics Exam 2 Practice Problems ANSWER KEY
Fall 2012
Question 1.
a. Z = (43 50)/3 = -2.33; critical z = -1.64 for a 1-tailed test; reject the null hypothesis
b. Type I error; % associated with Z o
Statistics Exam 2 Practice Problems
Fall 2012
1. A mood questionnaire has been standardized so that the scores form a normal distribution with a mean of 50
and a standard deviation of 15.A psychologis