Bio2010exam2
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Independent t-Test by
Regression
1
Acknowledgement
Thank you to Prof. Schmidt for the data,
formulas, etc. for this lecture!
2
Example
We believe that the group of children
receiving math training will have higher
scores than the group who did not receive
Repeated Measures ANOVA
Problem 1
A researcher reinforced 6 rats with food at
the end of running in a complex maze. He
recorded the number of errors the rats made
in the maze as a measure of learning. He
tested the rats after 1 week, 2 weeks, and 3
weeks.
Two-Way ANOVA
Schacter & Singer Study
Informed vs. Uniformed
Euphoria vs. Anger
2 factor study
Factorial Designs
Each level of one factor is administered with each
level of another factor
2 X 2 = factors, treatments
2 X 3 = factors, treatments
2 X
Analysis of Variance
Problem #1
A department chair wants to determine if
there are differences in how well students
learn introductory psychology based on
which instructor they have. She compared
average scores for three classes with
different instructors
t Tests
1
One-Group t Test
The local grocery store advertises that its
bags of apples weigh an average of 5
pounds. To check this claim you randomly
selected a sample of 25 bags. The average
weight of the sample was 5.20 pounds with
a standard deviation
1
Introduction
Syllabus questions?
Labs begin on Monday Jan. 23
2
Hypothesis Testing Review
3
Example 1
On a reading test, the national population
mean is 100 with a standard deviation of 15.
A sample of 36 youngsters from a local
school district has a
Choosing the Appropriate
Statistic
Methods
Pre-Experimental Designs
One-Group Posttest Only
One-Group Pretest-Posttest
Quasi-Experimental Designs
Nonequivalent Control Group Pretest-Posttest
Untreated Control Group With Proxy Pretest
Interrupted Time-
Choosing the Appropriate
Statistic
Methods
Pre-Experimental Designs
One-Group Posttest Only
One-Group Pretest-Posttest
Quasi-Experimental Designs
Nonequivalent Control Group Pretest-Posttest
Untreated Control Group With Proxy Pretest
Interrupted Time-
Advanced Statistics
1
Multivariate Analysis
Bivariate-investigates relationships between
any two variables
Multivariate-examines relationships among
more than two variables
2
Multivariate Analysis of Variance
(MANOVA)
Two or more dependent variables
D
Independent t-Test by
Regression
1
Acknowledgement
Thank you to Prof. Schmidt for the data,
formulas, etc. for this lecture!
2
Example
We believe that the group of children
receiving math training will have higher
scores than the group who did not receive
Correlation and Regression
Example
I believe there is a negative relationship
between missing 3006 classes and and the
number of happy thoughts a student has in a
day. In a survey you ask 10 people how
many 3006 classes they missed and also
how many happ
Correlation and Regression
Example
I believe there is a negative relationship
between missing 3006 classes and and the
number of happy thoughts a student has in a
day. In a survey you ask 10 people how
many 3006 classes they missed and also
how many happ
Chi Square Test of Independence
Chi Square Test of Independence
Two variables
Want to know if two nominal variables are
related
Mutually exclusive categories
Examples
Is there a relationship between greek life and
honor roll?
Is there a relationship
Chi Square Test
For Goodness of Fit
Example 1
You and your friend decide to play a gambling
game. A coin is tossed 80 times and she wins $5
for every heads and you win for every tails. The
result is 50 heads and 30 tails. She wins $100.
is this different
Quasi-Experimental Designs
True Experiment Issues
Random assignment
Manipulation
Ethics
Two Major Classes
Nonequivalent comparison-group designs
Interrupted time-series designs
Nonequivalent Control Group
Pretest-Posttest
Potential Outcome
Potential
Threats to Internal Validity
1
Appropriateness of Research
Findings
Procedures
Conclusions
Four types of validity
2
Statistical
Definition
Threat
3
Construct Validity
Definition
Threat
4
Three Measures of Construct
Validity
Criterion validity
Predictive v