Producing
Data Sampling
PSY 2003
Introduction: Key ideas
Sampling is a process
Samples are the results of the process
Sampling theory is about the process
There exists ideal sampling processes that
result in trustworthy samples
Failure to comply with thes
Week 2 Assignment
1. Six hundred accidents that occurred on a Saturday night were analyzed. Two items
noted were the number of vehicles involved and whether alcohol played a role in the
accident. The numbers are shown below:
Did alcohol play a role?
Yes
N
Index Number: the Consumer
Price Index
Psy 2003
Prof. Robert Terry
Consumer Price Index
Index number that allows us to adjust for known
eects of ina;on
Value
Unit 2 Review
Questions
Summary of CPI
The CPI is a measure of the cost of fixed goods which adjusts for the
known effects of inflation
It is NOT a cost-of-living index (we can control out spending habits)
It is severely limited in its ability to accou
Measurement Case Studies in
Medicine and Health-related elds
Psy 2003
Prof. R. Terry
Radiology
J Am Med Dir Assoc. 2006 Sep ;7 (7):416-9
Interobserver reliability of radiologists' interpretaQons of
mobile chest
Producing Data Design
PSY 2003 Online
Prof Robert Terry
Summer 2006
Design and Validity
Sampling External Validity: Do results
generalize beyond the sample?
Measurement Construct Validity: Is the
measure a TRUE measure of the construct of
interest?
Des
Measurement
PSY 2003
Prof. Robert Terry
Examples
When asked about income, people may
Inten7onally lie about income
Not know their actual income
Not remember details (Tucson Garbage Study)
Self-reports o
Introduction to Visual Descriptions
PSY 2003 Online
Summer 2006
Prof. Robert Terry
Pictures versus Words?
If the balloons popped, the sound would not be able to carry since
everything would be too far away from the correct floor. A closed
window would al
Visual Revelations
Psy 2003
Prof. R. Terry
General Rules for Good Graphs
u
Highlight the most interesting relationships.
Make sure your intended audience gets your point!
u
Avoid distorting the data.
Start at the zero point
u
u
Use consistent formatting
Unit 3 Quiz Review
8 March 2017
Common mistake or best practice?
Using 3d rather than 2d
Using pictograms
Expanding pictograms in only one direction (height or width)
Including the zero point
Using a bar chart for five or fewer data points
Using a h
1. A. This is a little confusing because their hypothesis has nothing to do with large urban
centers.
2. D. Candidate preference; More than 2
3. E. Randomly dial phone numbers. This is the best approach of those listed, but that
doesnt mean its a good app
The five-number summary for all student scores on
an exam is 29, 42, 70, 75, 79. Suppose 200 students
took the test. How many students had scores
between 42 and 70?
(A) 25
(B) 28
(C) 50
(D) 100
0040v01
A distribution has many more scores above the mean
th
STAT 1450 Recitation Activity 3
Normal Distributions
Student Name: _
Date:
_
OBJECTIVES
Students will review select concepts regarding numerical descriptions of data.
Students will use JMP to produce graphs and summary statistics.
Students will apply t
STAT 1450 Recitation Activity 1
Foundational Items and Instructional Technologies
Student Name: Deja Bell
TA Name:
James Willard
Date:
January 11th,2017
OBJECTIVES
Students will review course policies and expand their support network.
Students will asse
B AD 6243: Applied Univariate Statistics
Assignment # 2
Due Date: October 3, 2016
Assume you are involved in a study that examines the efficacy of a vocational training program for
at-risk youths You have collected data from a random sample of 1000 subjec
Drug testing example for conditional probability
Suppose that a drug test for an illegal drug is such that it is 98% accurate in the case of a
user of that drug (e.g. it produces a positive result with probability .98 in the case that the tested
individua
Some well-known difference equations and their equilibria
NAME
Arithmetic
sequence
EQUATION
x = d
EQUILIBRIA
none
STABILITY
A = 0 if
R 1
stable if
xn +1 = xn + d , ( d 0 )
xn = x0 + d n
Geometric
sequence
x = k xn
xn +1 = R xn , ( R = 1 + k )
solution: xn
Linear Regression and Correlation Notes
Suppose there is a data set of n data points (x i , y i ) where you have plotted these using a scatter
plot and it appears that a linear relationship between them is reasonable. Then the least-squares
line (regressi
MATH 151.003
Section 58 Compound Events
and the Laws of Probability
4/4/2006
Compound Events
Example: (at least) 2 different blood type classifications ABO and Rh-antigen factor
Description:
Notation:
Venn Diagrams:
page 1 of 4
MATH 151.003
Section 58 Com
Name:
TA:
Score:
/36
Psychology 2003Introduction to Statistics
Group Quiz 5
For each of the questions, do the following:
1.
2.
3.
4.
State the statistical hypotheses
Compute Zobt and look up pobt
State the critical Z and p values
Make a conclusion
1. Jack
Name:
TA:
Score:
/30
Psychology 2003Introduction to Statistics
Group Quiz 4
For each of the questions, do the following:
1.
2.
3.
4.
State the statistical hypotheses
Compute Zobt and look up pobt
State the critical Z and p values
Make a conclusion
1. Jack
Name:
TA:
Score:
/55
Psychology 2003Introduction to Statistics
Individual Quiz 2
1. Plot the dataset using the data listed (6 points).
X
15
2
7
4
8
4
12
12
8
6
13
5
11
7
6
2
8
5
9
13
10
Y
4
0
0
5
10
2. Compute the correlation between X and Y (14 points).
Name:
TA:
Score:
/20
Psychology 2003Introduction to Statistics
Group Quiz 3
Section 1. Z score questions
The mean IQ for all people is 100 with a standard deviation of 15. Also, there are 312,351,445 people in the
U.S. Use that information to answer the f
Name:
TA:
Score:
/40
Psychology 2003Introduction to Statistics
T Tests
For each of the following questions, be sure to
1.
2.
3.
4.
5.
State the statistical hypotheses,
Compute the t,
State the critical t and p values,
Compare tcrit to tobt , and
Make a co
Name:
TA:
Score:
/25
Psychology 2003Introduction to Statistics
t statistic and r test
For each of the following questions, be sure to
1.
2.
3.
4.
5.
State the statistical hypotheses,
Compute the t,
State the critical t and p values,
Compare tcrit to tobt
Name:
TA:
Score:
/40
Psychology 2003Introduction to Statistics
T Tests
For each of the following questions, be sure to
1.
2.
3.
4.
5.
State the statistical hypotheses,
Compute the t,
State the critical t and p values,
Compare tcrit to tobt , and
Make a co
Names:
TA:
Score:
/60
Psychology 2003Introduction to Statistics
Group Quiz 1
For each of the following questions, use the following dataset:
6 6 8 11 6 6 11 9 12 14 8 12 13 10 8 8 10 8 6 14
1. Plot the data using the most appropriate frequency plot, assum
Name:
TA:
Score:
/20
Psychology 2003Introduction to Statistics
Individual Quiz 1
1. Compute the range, variance, and standard deviation for the following dataset (7 points):
434231253
2. Add 10 to each of the scores in the previous question. What is the n
z-score of 1.29 on the table it shows a score of .0985 which is
larger than .05 so the hull is rejected.
the zscore is -.6495 on the table its .2611 which is also larger
than .0525.