Screen Stage Lecturers desk Row C Row D
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MGMT 276: Statistical Inference in Management Spring 2015
Schedule of readings Before next exam: February 17 th Please read chapters 1 - 4 & Appendix D & E in Lind 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
By the end of lecture today 2/12/15 Measures of variability Standard deviation Variance Review for Exam 1
No Homework due Tuesday, Feb th 17 Just study for Exam 1
Exam 1 – This Tuesday February 17 th Study guide is online Bring 2 calculators (remember only simple calculators, we can’t use calculators with programming functions) Bring 2 pencils (with good erasers) Bring ID Stats Review by Jonathon When: Monday evening February 16 th - 6: 00 – 7: 50 pm Where: Bio East 100 Cost: $5. 00
Review of Homework Worksheet
Review of Homework Worksheet 3 – 5 = -2 6 – 5 = +1 50 2 5 . 625 -22= 4 -2 1 3 -1 0 3 -3 -1 1 -1 4 1 9 1 0 9 9 1 1 1 0 36 = 2 10 - 1 4. 5 2 8 12= 1 36 4 6
Review of Homework Worksheet -12= 1 5 – 6 = -1 -1 2 -1 -1 3 60 2. 4 6 1 4 1 1 9 8 – 6 = +2 0 -1 3 1 -5 0 52 10 - 1 1 2 2= 4 0 1 9 1 25 52 = 2. 4 5. 5 9 5 8
Review of Homework Worksheet Must be complete and must be stapled
Standard deviation: The average amount by “Sum which observations deviateofon either side of their mean Square s” Remember, it’s relative to the mean “n-1” is “Degrees of Freedom” Based on difference from the mean Please memorize these Deviation scores Diallo is 0” Preston is 2” Mike is -4” Hunter is -2 Shea is 4 David 0” Generally, (on average) how far away is each score from the mean? Mean Diallo Remember, We are Presto n She thinking Mik in aterms of e “deviations”
Summary of 7 facts to memorize
Movie Packages We sampled 100 movie theaters (Two tickets, large popcorn and 2 drinks) 12 Frequency 10 8 6 4 2 0 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 Price per Movie Package Mean = $37 Range = $27 - $47 Standard Deviation = 3. 5
Amount of Bonuses (based on commission) We sampled 100 retail workers 68% 95% 99. 7% Mean = $50 Range = $25 - $75 Standard Deviation = 10
Pounds of pressure to break casing on an insulator (We applied pressure until the insulator casing broke) Mean = 1700 pounds Range = 1200 – 2100 Standard Deviation = 200 2100– 1700 = 400 What’s the 1200 – 1700 = largest 500 possible deviation? What’s the ‘typical’ or standard deviation?
Amount of Bonuses (based on commission) We sampled 100 retail workers $75 – $50= $25 Mean = $50 Range = $25 - $75 Standard Deviation = 10 What’s the $25 – $50= -$25 largest possible deviation? 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) Mean = 3 minutes Range = 2. 2 - 3. 8 Standard Deviation = 0. 30 3. 8 – 3. 0=. 8 2. 2 – 3. 0= -. 8 What’s the largest possible deviation? What’s the ‘typical’ or standard deviation?
Scores, standard deviations, and probabilities Actually 95. 44 To be exactly 95% we will use z = 1. 96 Actually 68. 26
Random sampling vs Random assignment of participants into groups: Any subject had an equal chance of getting assigned to either condition (related to quasi versus true experiment) Random sampling of participants into experiment: Each person in the population has an equal chance of being selected to be in the sample Rev iew
From the lab review IV: Nominal Ordinal Type of Independent Interval or Mariska works at a cattle ranch, and wants Cow Chow Variable? Ratio? IV: cattle to gain as much weight as possible. Discrete Continuous No, only Random Mariska wants to know if the new feed makes a or discrete? Random convenience Sampling? DV: Nominal difference in how much weight the cattle gain. Assignment? sampling Assignment Ratio Ordinal Weight Dependen (True Expt) Interval or t She gathers the first 100 cows that she finds DV: Ratio? Variable? in the meadow, and then randomly assigns those 100 cows into two groups (50 each group) One group gets the new feed for 6 months, while the other group of cattle gets the old feed. She is not looking for any trends over time, but is just looking for a difference between the two types of cow chow (feed). Continuous or discrete? Betweenor Between Participant within? Design Cross Sectionalor Sectional Time Series
Question 9 - Does amount of sleep (4 vs 8 hours) affect class attendance? Selected 350 students from 38, 000 undergraduates at U of Washington and randomly assigned students into two groups. What is the independent variable? - Amount of sleep How many levels are there of the IV? - 2 levels (4 hours vs 8 hours) What is the dependent variable? Group 1 gets 4 hours sleep - Class attendance What is population and sample? - Population: whole school Note: Parameter would - Sample: group of 350 students be what we are guessing for the whole school What is statistic ? based on these 350 students Group 2 gets 8 hours sleep - Average class attendance for 350 students Quasi versus true experiment (random assignment)? - True Random sample? - Doesn’t say in the problem, so we have to assume “no”
Question 10 - Does gender of the teacher affect test scores for the students in California? Selected 150 students from Santa Monica and created two groups. What is the independent variable? - Gender of teacher How many levels are there of the IV? - 2 levels (male vs female teacher) Group 1 gets a female teacher Group 2 gets a male teacher What is the dependent variable? - Test Scores What is population and sample? - Population: California - Sample: group of 150 students from Santa Monica What is statistic ? - Average test score for 150 students Quasi versus true experiment (random assignment)? - Doesn’t say in the problem, so we have to assume “no” Random sample? - No – Random sample would require that everyone in California be equally likely to be chosen.
Writing Assignment – Pop Quiz 1. What does symbol refer to? • What is itthis called? • What does it mean? • Is it referring to a sample or population? 2. What does symbol refer to? • What is itthis called? • What does it mean? • Is it referring to a sample or population? 3. What does symbol refer to? • What is itthis called? • What does it mean? • Is it referring to a sample or population? 4. What does this symbol refer to? • What is it called? • What does it mean? • Is it referring to a sample or population? 5. What does this symbol refer to?
Writing Assignment – Pop Quiz 6. What does this refer to? • What are they called? • What do they refer to? • How are they different 7. What does this refer to? • What are they called? • How are they different 8. What do these two refer to? • What are they called? • How are they different 9. What does this refer to? • What is it called? • Use it for sample data or population?
Writing Assignment – Pop Quiz 10. What does this refer to? • What are they called? • What do they refer to? • How are they different 11. What does this refer to? • What are they called? • What do they refer to? • How are they different
Writing Assignment – Pop Quiz 1. What does symbol refer to? • What is itthis called? sigm a • What does it mean? tion a l u • Is it referring to a sample or population? 2. What does symbol refer to? • What is itthis called? mu • What does it mean? tion a l u p • Is it referring to a sample orpo population? 3. What does symbol refer to? • What is itthis called? x-ba • What does it mean? r le amp s • Is it referring to a sample or population? 4. What does this symbol refer to? • What is it called? s • What does it mean? ple sam • Is it referring to a sample or population? 5. What does this symbol refer to? The st dev andar (po iatio d pul n atio n) Th (po e mea pul n atio n) The (sam mean ple ) The st dev andar d i (sam ation ple ) Each ind ividual score
Writing Assignment – Pop Quiz p Variance S squ ared squa roen d e i pl at l m u sa op Sigm a Deviation scores n pl e p m 8. What do these two refer to? • What are they called? • How are they different e pl m sa sa 6. What does this refer to? • What are they called? • What do they refer to? • How are they different 7. What does this refer to? • What are they called? • How are they different n io t a ul p o at ul io p po Sum of squares 9. What does this refer to? • What is it called? • Use it for sample data or population? Degrees of freedom
rd a d n Sta ation i v e D Writing Assignment – Pop Quiz pu m pl tio la e e n c n a ri Va m e n io at pl l pu sa po 11. What does this refer to? • What are they called? • What do they refer to? • How are they different sa po 10. What does this refer to? • What are they called? • What do they refer to? • How are they different
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