HW #5: Single Sample Means t Test
You read in the Cav Daily that the average student rates a 3 on a 10-pt depression scale (1=not at all;
10=extremely). The reporter didnt state the SD and you cant reach the reporter to see the actual data.
You thought p
Exam 2 Review
Research Methods & Data Analysis
I
Minhong Yu
Population vs. Sample
Means of samples
M, M
Population Sample
M, SD (S)
,
2000
1000
Sample size=100
-4
-2
0
2
4
0
0
5
Frequency
Frequency
5000
nSamples=10000
10 15 20
N=100
15000
N=100000
0
Freq
Lecture 7
Correlational Research/
Intro to Hypothesis Testing
Research Methods & Data Analysis
I
Fred Smyth
Exam 1 next Tuesday
Steps to success:
Master text book exercises/practice
problems
Know how to calculate variance/standard
deviations, understand t
Lecture 7
Correlational Research/
Intro to Hypothesis Testing
Research Methods & Data Analysis
I
Fred Smyth
Clicker
Q
If you cant reject the null hypothesis,
your study result is
A.
conclusive
B.
inaccurate
C.
inconclusive
D.
invalid
E.
statistically sign
Lecture 3
Centrality and Variability
Research Methods & Data Analysis
I
Fred Smyth
Fall, 2012
Centrality and Variability
Averages can be misleading if you dont know how
how the events were distributed.
2
C
What kind of research was our
cola study?
A.
B.
C
Lecture 4
Z Scores and the
Normal Curve
Research Methods & Data Analysis
I
Fred Smyth
Fall, 2012
C
A.
B.
C.
D.
E.
If you earned a Z score of 2.5 on some
test, how do you compare to the other
test-takers?
Im right at the mean
Im 2.5 points above the mean
I
Lecture 5
Samples and Probability
Research Methods & Data Analysis
I
Fred Smyth
C
You could get this
item right or
wrong, so its a
variable. 60% got
it right.
C
A.
B.
C.
What kind of variable is it?
Behavioral
Organismic
Stimulus
C
A friend of yours has a
Lecture 6
Low-Constraint
Research
Research Methods & Data Analysis
I
Fred Smyth
Exam-1: One week from
Tuesday
In class, but using your laptop and Collab
Thursday, 9/20, brief in-class orientation
exam
Also 9/20, Q&A session 6:30-730p, Chemistry
340
By Wed
Lecture 9
Hypothesis Tests
with Means of Samples
Research Methods & Data Analysis
I
Fred Smyth
Clicker
Q
Which of the following is
correct?
A.
M =
B.
M =
C.
2 M = 2
D.
All of above
E.
None of above
Clicker
Q
A.
B.
C.
Which of the following is
correct?
T
Optional Homework
Psych3005, Section 2
Professor Fred Smyth
October 23, 2012
Q1. You looked at six high school students who are applicants to UVA and their number of extracurricular
activities is as follows: 0, 1, 4, 4, 5, 10. A recent U.S. News survey re
Optional Homework
Psych3005, Section 2
Professor Fred Smyth
October 23, 2012
Q1. You looked at six high school students who are applicants to UVA and their number of extracurricular
activities is as follows: 0, 1, 4, 4, 5, 10. A recent U.S. News survey re
PSYC 3005 Exam 1 Study Guide
Chapter 1: Measurement and Data Description
Branches of Statistical Methods
o Descriptive Statistics: A branch of statistics in which the goal is to summarize a collection of numbers in a
useful way.
o Inferential Statistics:
Name: _ ID: _ Lab section: _
Homework Assignment #4: One Sample and Dependent Samples t-test (40 points)
Answer all questions below using the appropriate type of t-test in SPSS. For each question, determine if you should
report 1- or 2-tailed results base
Name: Caroline Sherwood
ID: cbs5hm
Lab section: 216
Homework Assignment #2: Descriptive statistics (40 points)
Directions: Use the numHS (high school graduating class size) variable to answer the questions below (labdata3005f16.sav
dataset). Make sure to
Name: Caroline Sherwood
ID: cbs5hm
Lab section: 216
Homework Assignment #5: Independent Samples t-test (40 points)
Directions: Answer all questions below. Make sure to include a print out of your relevant SPSS output with your completed
assignment. Dont f
Final Exam Review
EXAM 1 MATERIAL
Types of Variables
Nominal
Values are categories (political affiliation, church denominations)
No numeric aspect
Ordinal
Rank order variables
Convey the same numerical info (1st, 2nd, 3rd, 50th, etc.)
Interval
Equal inter
Exam 1 Review
Research Methods & Data Analysis
I
Minhong Yu
Why is variance squared?
Variance = Sum of squared deviations / N
Squared because:
(1) If variance = sum of deviation, variance
is always 0. We need to make deviation no
directional.
(2) We want
Lecture 8
Introducing Hypothesis
Testing
Research Methods & Data Analysis
I
Fred Smyth
Bring to the Exam on Tuesday:
1.
2.
3.
4.
5.
6.
Laptop/tablet (this will be only testing
option)
Calculator (but no use of stats
functions)
1 sheet scratch paper
Pen or
Lecture 8
Introducing Hypothesis
Testing
Research Methods & Data Analysis
I
Fred Smyth
Clicker
Q
The most widely agreed upon
criticism of the null hypothesis
significance testing approach is
A.
B.
C.
D.
Misuse of the approach is frequent
and has serious c
Lecture 6
Low-Constraint
Research
Research Methods & Data Analysis
I
Fred Smyth
C
Low-constraint research cannot do which
one of the following?
A.
B.
C.
D.
Establish a fact
Establish a general proposition
Negate a general proposition
Identify contingent r
Lecture 5
Samples and Probability
Research Methods & Data Analysis
I
Fred Smyth
Descriptive versus Inferential
Stats
Descriptive: characterizes the sample you
have. Mean, median, mode, variance,
range, standard deviation, etc.
Inferential: extrapolating f
Lecture 11
(more) Confidence Intervals
&
Research Methods & Data Analysis
Measurement
I
Fred Smyth
Clicker
Q
Reliability is mainly about
A.
B.
C.
D.
E.
Appropriate measurement
Consistent measurement
Ethical measurement
Justified measurement
Predictive mea
Lecture 10
Confidence Intervals
Research Methods & Data Analysis
I
Fred Smyth
3005 Exam 1
Max
99
Mode 86
Mode 89
Median 80
Median 79
Mean 78
Mean 13
78
SD
SD
12
38%
35%
31%
21%
17%
15%
15%
7%
F
12%
D
C
B
A
Which were leading predictors of Exam1?
Self-asse
Lecture 11
(more) Confidence Intervals
&
Research Methods & Data Analysis
Measurement
I
Fred Smyth
Note-taking help
Where does p < .05 (or p < .01)
come from?
Updated to match Aron, Aron, Coups
Originally presented in Lecture 9
Memorize!
-1.64 or 1.64 is
Lecture 12
Decision Errors & Effect Size
Research Methods & Data Analysis
I
Fred Smyth
Revised Syllabus on Collab
(only changes are to the
readings)
=
10000
60, 8.0
Population = Psyc GRE
testers from UVa-like
institutions Step 1
Research
(made Hypothesis
Lecture 12
Statistical Power
Research Methods & Data Analysis
I
Fred Smyth
Clicker
Q
A.
B.
C.
D.
E.
Statistical power is the probability of
getting a
false positive error
false negative error
significant result when = .05
significant result if the null hy
Lecture 14
t Test for a Single Sample
Research Methods & Data Analysis
I
Fred Smyth
Typo in reading for next class:
AAC p. 247
Effect Size section
Second sentence should begin, d is the
difference
NOT t is the difference
Single sample t-test
More than 1 p
Lecture 12
Decision Errors & Effect Size
Research Methods & Data Analysis
I
Fred Smyth
Clicker
Q
Which of these is the formula for
the d effect size?
A.
B.
C.
Clicker
Q
Meta-analysis involves
A.
B.
C.
D.
E.
Studies with 1000 or more participants
Analysis
Preference for Same- Versus Cross-Sex Friendships Baumgrate and Nelson
The researchers of this study studied the preference for same-sex and cross-sex
friendships. The hypothesis is that the preference for same-sex versus cross-sex friendship is
associate