1. Introduction to Statistics for the Social Sciences SBS200, COMM200, GEOG200, PA200, POL200, or SOC200 Lecture Section 001, Spring 2016 Room 150 Harvill Building 9:00 - 9:50 Mondays, Wednesdays & Fridays
Welcome

3. By the end of lecture today 4/4/16
Review for Exam 3

4. Before next exam (April 8th)
Please read chapters in OpenStax textbook
Please read Chapters 2, 3, and 4 in Plous
Chapter 2: Cognitive Dissonance
Chapter 3: Memory and Hindsight Bias
Chapter 4: Context Dependence
Study guide is online
Review worksheet is also available online

5. To your TA during lecture
Hand in your project 3
To your TA during lecture

7. Lab sessions Everyone will want to be enrolled
in one of the lab sessions
No Labs this week

8. Remember, it never will be if the observed t is less than one
Yes, p < .05, reject the null and it is a significant difference
No, p is not < .05, do not reject the null and there is no significant difference
No, p is not < .05, do not reject the null and there is no significant difference
Remember, it never will be if the observed t is less than one
small observed t score

9. or decrease level of confidence
Decrease variability
or decrease level of confidence
It is easier to reject the null
It gets narrower
Easier; use a one-tail
test when you have a
unidirectional prediction
Use a t-test when don’t know population standard deviation and only have sample standard deviation (Same is true for variance or variability)

10. Type of cartoon will not affect level of aggression
Two-tail
True 48
2.011
Type of cartoon will not affect level of aggression
Type of cartoon will affect level of aggression
Type of cartoon will not affect aggression when it fact it will
Type of cartoon will affect aggression when it fact it will not

11. Common and rare scores
Go down from .05 to .01
Mean approaches the true population mean
Shape approaches normality
Variability goes down
No, never reject null if the prediction in a one-tailed test is wrong

12. 78 79 14
The mean test scores were 78 for the men and 79 for the women enrolled in Dr. Rubio’s class. A t-test was conducted and no significant difference was found,
t(14) = -0.23; n.s.

13. 12 3 25
100 4
3.49
Yes
Yes
The mean home prices were compared for these four neighborhoods. The average selling price was 65.5 million dollars in the Southpark neighborhood, 71 million dollars in the Northpark neighborhood, million dollars for the Westpark neighborhood and million dollars for the Eastpark neighborhood. An ANOVA was conducted and a significant main effect was found, F(3,12) = 4.00; p < 0.05.

14. 27 2 40
6.518
6.1
3.35
Yes
Yes
The mean number of cookies sold was 10 boxes for the girl scouts offered no incentive, 12 boxes for the girl scouts offered a new bike and 14 boxes for girl scouts offered a trip to Hawaii. An ANOVA conducted and a significant main effect was found, F(2, 27) = 6.14; p < 0.05

15. 95% 42 58
42.16
57.40

16. Thank you!
See you next time!!