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. By the end of lecture today 9/19/16
Use this as your
study guide
By the end of lecture today 9/19/16
Characteristics of a distribution
Central Tendency
Dispersion
Measures of variability
Range
Standard deviation
Variance
Memorizing the four definitional formulae

3. Schedule of readings Before next exam (September 23rd)
Friday:
University ID
4-digit class ID
2 pencils
2 calculators
Seating Chart
Study guide
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. Labs continue this week
Lab sessions
Labs continue this week
Everyone will want to be enrolled
in one of the lab sessions

5. Labs continue this week
Lab sessions
Labs continue this week
Everyone will want to be enrolled
in one of the lab sessions

6. Summary of 7 facts to memorize

8. Homework Assignments 7 & 8 Please complete the homework worksheets
Calculating Descriptive Statistics
And Presenting Findings in a Memorandum
Due: Today

9. Review of Homework Worksheet
Each of these are deviation scores
3 – 5 = -2
-22= 4
6 – 5 = +1 -2 1 3 -1 4 1 9
12= 1 3 -3 -1 1 9 1
Σ(x - µ) = 0 50 36 36 2
= 2
10 - 1
This is the standard deviation! 5 4
4.5 2 8 6

10. Review of Homework Worksheet
-12= 1
5 – 6 = -1 -1 2 3 1 4 9
22= 4
8 – 6 = +2 -1 3 1 -5 1 9 25 60 52 52
2.4
= 2.4
10 - 1 5 6
5.5 1 9 8

11. Summary of 7 facts to memorize

12. Price per Movie Package
Movie Packages We sampled 100 movie theaters (Two tickets, large popcorn and 2 drinks)
What is the
most common
“deviation score”? 12
Deviation = 0 10
Frequency 8 6 4 2
Price per Movie Package
This distance is about
3 - 4 points on number line
What’s the ‘typical’ or standard deviation?
Mean = $37
Range = $27 - $47
Standard Deviation = 3.5

13. Amount of Bonuses (based on commission) We sampled 100 retail workers
68%
95%
99.7%
What’s the ‘typical’ or standard deviation?
This distance is about
10 points on number line
What’s the largest
possible deviations?
Mean = $50
Range = $25 - $75
$75 – $50= $25
$25 – $50= -$25
Standard Deviation = 10

14. Pounds of pressure to break casing
on an insulator (We applied pressure until the insulator casing broke)
What’s the ‘typical’ or standard deviation?
This distance is about
200 points on number line
Mean = 1700 pounds
Range = 1200 – 2100
What’s the largest
possible deviation?
= 400
Standard Deviation = 200
= -500

15. What’s the ‘typical’ or standard deviation?
Waiting time for service at bank We sampled 100 banks (From time entering line to time reaching teller)
What’s the ‘typical’ or standard deviation?
This distance is about
points on number line
Mean = 3 minutes
Range =
What’s the largest
possible deviation?
=.8
=-.6
Standard Deviation = 0.30

16. Quiz: Just for fun
Monthly electric bills for 50 apartments (amount of dollars charged for the month)
Mean = $150
Range =
The best estimate of the population standard deviation is
a. $150
b. $25
c. $50
d. $63
Standard Deviation = 25

17. You already know this by heart
1 sd above and below mean
68%
2 sd above and below mean
95%
3 sd above and below mean
99.7%
68%
Confidence interval
95%
Confidence interval
99%
Confidence interval
You already know this by heart

18. Thank you!
See you next time!!