Psychology 100A
2013 Summer
Midterm 1: Answers with explanations
1. Consider the hypothesis test that compares the IQ scores of people who take a smart pill and people who do
not take a smart
pill. Here are the scores. The scores in the two groups are not
Correlation
Quantification of the linear relationship between
ANY two interval or ratio variables.
What is the relationship between:
IQ and GPA?
Calcium intake and bone density?
Measures of spirituality and mental health?
Tobacco use (avg. daily number)
Statisicks
2 branchs of statisticks
1)descriptive statisticks
organize,summarize, and communicative numerical information

a population is the complete set of things in which we are interested could
be any size
a sample is a set of observations drawn f
Essentials of Statistics for the Behavioral Sciences, 2 nd
Susan A. Nolan
Thomas E.
Edition
Heinzen
OneWayANOVA
Chapter11
RevisedbyJeffreyB.Henriques,Ph.D.
UniversityofWisconsinMadison
Essentials of Statistics for the Behavioral Sciences, 2 nd
Susan A. No
100 A Midterm Practice
Mean: The mathematical average, X =
X
N
Median: The score on X at the 50th percentile, or the score that divides the sample in half
Mode: The most frequently observed score in a distribution.
1. Define the two indices of sample vari
Ainsworth
Final Exam Practice problems
1. True or False: ANOVA is a statistical measure adopted to analyze differences in group
variances.
2. True or False: If you do not have a significant interaction, you would still want to conduct
posthoc tests such
Ainsworth
Final Exam Practice problems
1. True or False: ANOVA is a statistical measure adopted to analyze differences in group variances.
Not for differences in group variances, but for difference in group means.
2. True or False: If you do not have a si
Hi everyone,
This document includes some of the important equations you should be familiar with. It is not an exhaustive
document but nonetheless contains some good stuff. I hope you find it useful. Good luck studying  I know you
will do well!
One Way AN
100a
Ainsworth
Practice Problem 1way ANOVA
1. IV = Depressed individuals were randomly assigned to receive either rational emotive
behavioral therapy (REBT), cognitive therapy, psychoanalysis or no therapy (control).
DV = number of weeks until depressive
Essentials of Statistics for the Behavioral Sciences, 2nd Edition
Susan A. Nolan
Thomas E. Heinzen
The PairedSamples
tTest
Chapter 9
pair of observations (compare sample
to sample  within groups study)
Revised by Jeffrey B. Henriques, Ph.D.
University
Name:
Student ID:
Psychology 100A Quiz 1
1) A psychologist plans to perform a statistical test. If the null hypothesis is true, the
probability that she will reject the null hypothesis is 0.05, and the probability that she
will fail to reject the null hyp
Sampling Mean Distributions
Working with sample means
Often, were interested to know how a
sample of observations compares to the
broader population
Studies tend to be better received when done on
more than on person
Working with sample means
Some inte
Hypothesis tests
Single sample Z
(
Zobs=
) ()
_
Hypothesis tests
Single sample t
(
tobs=
) ()
_
S
But
Very rarely do we have any population
information available or hypothetical
comparison values
Most often, we need to provide our own
control groups
Two
Welcome!
UCLA Psychology 100A
Psychological Statistics
Zachary Moran, Ph.D., Instructor
Lauren Berkovits, M.A., Teaching Assistant
Frequently asked question so far:
Should I take your statistics class?
Short answer
Beats me!
More interesting answer
Maybe
Probability
An essential component of statistics
What is Probability
Due to ignorance about the true nature of
things
A means for making predictions given the
interaction between the limited knowledge
of an observer and the actual events of
the universe
Quick Review
Oneway BetweenSubjects
ANOVA
Were looking to compare the means
of 3+ groups to see if there are any
differences amongst them.
Compare variability between the
groups (MSB/W) to the individual
variability that exists within each
group (MSW
Where we are
Where we are going
Statistical analyses by number of sample groups
1  Single sample Z or t tests
2 T tests (dependent, independent)
3 or more ?
Analysis of variance
Between subjects (independent)
Equal N (Easy)
Unequal N (Harder structural
ANOVA
Between and within subjects
Suppose you are a cell phone designer, and you would like to test
four phone designs:
flat, flip, folded, and telescoping.
You're interested in whether there is a difference between these
phone types in how much they are
Week 2 Lecture 8/15/2013
UCLA Psychology 100A
Psychological Statistics
Hypothesis Testing and
Single Sample ZTest
Descriptive and Inferential Statistics
What weve focused on mostly so far:
Descriptive statistics: The science of describing
Name:
Student ID:
Psychology 100A Quiz 1
Question 1 refers to the following population of observations: 1, 4, 5, 10
(1a) Calculate the mean of these observations. Please circle your final answer. (1 point)
Answer: 5
(1b) Calculate the variance of these ob
Quiz 14 Correlation
https:/ccle.ucla.edu/mod/quiz/review.php?attempt=896373&s.
Control Panel
/ 16WPSYCH100A1 / 14. Correlation
/ Quiz 14 Correlation
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