Psyc 2016
Statistics for the Behavioral Sciences
Fall 2015
Instructor
Janet McDonald
223A Audubon Hall
psmcdo@lsu.edu
Office hours:
Th 3p-4:30p; F 10:30a-12p
Lab TA Wed 12:30
Thanh Le
216 Audubon
tle87@lsu.edu
Office hours:
Th 10:00a-1:00p
Lab TA Wed 3:30

Lesson One (August 27, 2015)
As Psychologsist We Study human behavior
Statistics is one of the many tools we use to measure and assess behavior
Key Terms
Independent Variable
The thing that is being manipulated in an experiment
Ex. Face/ No Face
Dependen

Please turn in prior to the beginning of the session! Do NOT
put your name on this, I will read these after the session and
shuffle them up to maintain your confidentiality!
#1) Please circle which subject (from the selection) you find most difficult:
Fre

HW 5: Correlation
1. a) Draw a scatterplot of a small magnitude negative correlation.
b) Draw a scatterplot of a large magnitude negative correlation.
c) Explain how in comparing these two pictures you can see the magnitude is greater in b)
Boredom rating

HW 4 One sample t
1. An unstandardized test of narcissism has a mean of 4.22. You take a sample of 25 reality TV show
contestants and find they have a mean of 5.16 and a standard deviation of 2.89. Is their narcissism
different than the standard of 4.22?

PSYC 2016
Practice problems for latter third of the course
Please use the homeworks throughout the course as additional study aids. The practice problems for
exams 1 and 2 are also available on Moodle.
Your book also has several practice exercises with an

HW 10 Within subjects ANOVA
Breakfast Mean=4.23
Lunch Mean=4.65
Dinner Mean=5.23
SD=1.20
SD=1.12
SD=1.09
1. Consider the above information about hunger ratings by the same 12 people for three meals over the
course of a day. Mauchlys test is not significan

HW 5 Correlation
Practice time (X)
Free throws (Y)
1 2 1 4 2 1 6 5 2 1 3
6 6 5 8 4 3 9 4 5 3 5
1. Consider the above pairs of time spent practicing each day for a month and free throws completed
out of 10 attempts for 11 athletes.
a. State the null and al

HW 9 One way ANOVA
Undergraduates Mean=3.67
Graduates
Mean=2.17
Professors
Mean=1.67
Total
Mean=2.50
SD=1.23
SD=.83
SD=1.23
SD=1.38
1. Consider the above information about time spent on you-tube by three groups of people; there are 12
people in each group

Normal Distribution
Nominal, Ordinal, Interval, Ratio Data
IV and
DV and Scale of measurement
Frequency distributions
Measures of central tendency
o Mean, median, mode
o When to use which
Skewed data
Measures of variability
o Range, Variance, IQR
o When

Please turn in prior to the beginning of the session! Do NOT
put your name on this, I will read these after the session and
shuffle them up to maintain your confidentiality!
#1) Please circle which subject (from the selection) you find most difficult:
Fre

PSYC 2016
SI Worksheet #1
Activity 1: Intro
Below is a table that contains examples of variables psychologists would utilize for their experiments.
Looking at the characteristics of the independent (IV) and dependent (DV) variables, use the word bank
belo

PSYC 2016
SI Worksheet #4
Reminder: EXAM 1 Sept. 27
Activity 1: Concepts
A psychologist is testing whether native English speakers are more apt to get a better score on
standardized testing as opposed to non-native English speakers. In his test, he brings

PSYC 2016
SI Worksheet #2
REMINDER: HW 2 due Sept. 20, Exam 1 Sept. 27
Activity 1: Introduction
Looking at the data set below, we are looking at what psychologists found when surveying random
people at a shopping mall for which fruit they preferred the mo

ANOVA: continued
ANOVA Table
Source
Between
Sums Squared (SS)
df
K-1
SS B
SS E
Within (error)
ANOVA (F)
SS B
=MSB
K 1
MSB
MSE
SS E
=MSE
N K
N-K
SS T
Total
Mean Squared
N-1
K = the number of groups
N = total number of observations
N-K = the number of

Characteristics of Standard Deviation (SD)
The SD is always positive
The scores can either vary (SD > 0) or not vary (SD = 0)
The SD is used to describe quantitative variables
SD is a numeric value and used to describe variables measured in numeric v

Inferential Statistics
Population - everyone who has the characteristic you care about
Characteristics of the population are called parameters
They are represented by Greek letters
Mean -
Standard Deviation -
Sample-limited set of people from the popula

Analysis of dependent Group Designs
Matched pairs and repeated measures designs are analyzed in the same way
Dependent samples t test : 2 dependent groups
Also called a paired samples t test, related measures t test repeated measures test
Assumptions

Independent T-Test
Simple Independent T test
Independent Variable with 2 levels, one level is the control the other level is the experiment
group
Only One Dependent Variable
Random Assignment is very important to avoid bias when testing
2 different t

When your two tailed probability is less than your orientations you reject the null.
APA Format Update
The ACT scores of a sample of 58 students (M = 28.71; SD = 2.65) were proven significantly
different from 28 by a two tailed t tests t(57) = 2.05, p = .

HW 7 Independent t
King Kong
Bambi
3 2 4 3 2 3 4 3 3
1 1 2 1 3 1 1 4 2
1. Consider the scores on a test of aggression by two groups of movie goers. Are viewers of King Kong
more aggressive than viewers of Bambi? Assume homogeneity of variance.
a. State th

HW 8 Dependent t
Midterms
Final
4 3 4 2 3 5 4 5 3 4 6
2 2 3 2 1 6 4 3 2 5 3
Consider the above pairs of scores from 11 students who were asked to rate the amount of free time
they had during midterms week, and then again during finals week. Do students ha

HW 9 One way ANOVA
Undergraduates Mean=3.67
Graduates
Mean=2.17
Professors
Mean=1.67
Total
Mean=2.50
SD=1.23
SD=.83
SD=1.23
SD=1.38
1. Consider the above information about time spent on you-tube by three groups of people; there are 12
people in each group

HW 8 Dependent t
Midterms
Final
4 3 4 2 3 5 4 5 3 4 6
2 2 3 2 1 6 4 3 2 5 3
Consider the above pairs of scores from 11 students who were asked to rate the amount of free time
they had during midterms week, and then again during finals week. Do students ha

HW 2: Variability and graphs and z scores
Money spent on socks:
6810127989131110101479969881010126108
1. For the above data set, give the minimum and maximum score and calculate the range.
Min: 6
Max: 14
Range: 14 6 = 8
2. Calculate the standard deviation

HW 1: Frequency tables and means (10 points)
Money spent on socks:
6 8 10 12 7 9 8 9 13 11 10 10 14 7 9 9 6 9 8 8 10 10 12 6 10 8
(2 points total) For the above data set, make an ungrouped frequency table and include
columns for frequency, cumulative freq

PSYC 2016
SI Worksheet #3
REMINDER: HW 2 due Sept. 20, Exam 1 Sept. 27
Activity 1: Intro/Review
Scales of
Measurement
Characteristics (ex:
identity?)
Qualitative or
Quantitative?
Discrete or
Continuous?
Mode
Median
Mean
N
O
I
R
Scales of
Measurement
Nomin