1. Introduction to Statistics for the Social Sciences SBS200 - Lecture Section 001, Fall 2016 Room 150 Harvill Building 10: :50 Mondays, Wednesdays & Fridays.
Welcome

2. Lab sessions Everyone will want to be enrolled
in one of the lab sessions
Labs start
Today

3. Schedule of readings Before next exam (September 23rd)
Please read chapters in OpenStax textbook
Please read Appendix D, E & F online On syllabus this is referred to as online readings 1, 2 & 3
Please read Chapters 1, 5, 6 and 13 in Plous
Chapter 1: Selective Perception
Chapter 5: Plasticity
Chapter 6: Effects of Question Wording and Framing
Chapter 13: Anchoring and Adjustment

4. Homework Assignment 2 due Wednesday, August 31st Go to D2L - Click on “Content”
Click on “Interactive Online Homework Assignments”
Complete the next two modules:
Independent and dependent variables
Quasi- vs True Experiments
Between vs Within Participant Designs

5. By the end of lecture today 8/29/16
Use this as your
study guide
By the end of lecture today 8/29/16
Introduction to Project 1
Continuous versus discrete
Levels of Measurement: Nominal, Ordinal, Interval and Ratio

6. One group gets cocoa extract capsules
Other group
Placebo capsules
Measure likelihood
of heart attacks
What is the
independent variable?
What is the
dependent variable?
How many levels
are there of the IV?
“Between” or “within”
participant design?
Placebo

12. Placebo (single blind) versus double blind procedure
Single blind procedure (example: use of placebo)
Double blind procedure
What about experimenter bias?

13. Project Likert Scale (summated scale) - Correlation (scatterplots) - Comparing two means (bar graph)

14. Likert Scale is always a “summated scale” with multiple items.
All items are measuring the same construct. The score reflects the sum of responses on a series of items.
- miniquiz (like Cosmo - ask several questions then sum responses)
- For example, several questions on political views (coded so that larger numbers mean “more liberal”)
1. Lower taxes and a smaller
government will improve the standard of living for all.
agree disagree
2. Marriage should be between one man and one woman
agree disagree
3. Evolution of species has no place in public education
agree disagree

15. Likert Scale is always a “summated scale” with multiple items.
All items are measuring the same construct. The score reflects the sum of responses on a series of items.

16. “Serious Gamer” Score “Serious Gamer” Score “Serious Gamer” Score Time
One positive
correlation
One negative
correlation
Comparing
Two means
“Serious Gamer” Score
“Serious Gamer” Score
“Serious Gamer” Score
Time
Studying
Age
Gender

17. Project Likert Scale (summated scale) - Correlation (scatterplots) - Comparing two means (bar graph)

18. Scatterplot displays relationships between two continuous variables
Correlation: Measure of how two variables co-occur and
also can be used for prediction
Range between -1 and +1
The closer to zero the weaker the relationship
and the worse the prediction
Positive or negative

19. Positive correlation: as values on one variable go up, so do values
Positive correlation: as values on one variable go up, so do values for the other variable
Negative correlation: as values on one variable go up, the values for the other variable go down
Height of Mothers
by Height of Daughters
Height of Mothers
Positive
Correlation
Height of
Daughters

20. Positive correlation: as values on one variable go up, so do values
Positive correlation: as values on one variable go up, so do values for the other variable
Negative correlation: as values on one variable go up, the values for the other variable go down
Brushing teeth
by number cavities
Brushing Teeth
Negative
Correlation
Number Cavities

21. Project Likert Scale (summated scale) - Correlation (scatterplots) - Comparing two means (bar graph)

28. Thank you!
See you next time!!