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 34.13% (need to add 50%)
c. The probability that another
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 of subordinates increases, the job stress level of direc
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 might be necessary or helpful to thoroughly address the que
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 data show that when people work as fast as possible, the
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 people a director supervises (i.e., their subordinates) i
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 appropriate conclusion for the test.
d. Compute effect s
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 (Raw score to z-score; z-score to raw score)
Frequency Dis
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 payment
for each poem remembered correctly. The number
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 reason is that you can examine the interaction
between th
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 of 2.33 is 49.01%; so error is .99% or p = .0099
Questio
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 psychologist would like to use this test to examine how the enviro