Statistics
Measures of Variability Range = Largest value Smallest value o Advantage: Easy to compute o Disadvantage: Only use two values WB7-1 o Sample A: Range = 510 485 = 25 o Sample B: Range = 1000 0 = 1000
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Variance = "Av
How to get a good sample
What do we want in a sample? Representative As small as possible, yet still reliable Cheaper Definitions Unit: Single individual or object
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Population: Collection of all units of potential intere
Statistics 1200
Ries
100 points
Exam #3
SP2010 / Form F1
April 19, 2010
Name:_ Student #:_ Rec. sect.: _
Circle the name of your recitation instructor:
Nick
Brown
Na
Hu
Sungwook
(Peter)
Kim
Yang
Li
Xi (Kevin)
Luo
Jacob
Orme
Nil
Sanyal
Chang
Xu
=
Instructi
Statistics 1200, Evening Exam #3, SP2015
Evening Exam #3:
Mon., Apr. 20, 8 9 p.m.
Room assignments are shown on the next page.
Bring the following to the exam:
Photo I.D.
Calculator
Pencil(s)
Formula packet
Important reminders:
Be sure you know you
Stat Exam 3 Terms
Ch. 14, 19,20-24
Probability- A number between 0 and 1 that indicates the proportion
of time it occurs over the long run
Reflective Frequency Probability Assessment Requires- 1.
Repeatability 2. Independence- doesn't affect each other, c
Statistics 1200
SP2010 / Form F1
Ries
100 points
Exam #2
March 15, 2010
Name:_ Student #:_ Rec. sect.: _
Circle the name of your recitation instructor:
Nick
Brown
Sungwook
(Peter)
Kim
Na
Hu
Yang
Li
Xi (Kevin)
Luo
Jacob
Orme
Nil
Sanyal
Chang
Xu
=
Instructi
Stat Exam 2
Chapters: 8, 10, 11, 12, 13
1. Smooth frequency curve- the most common type of picture for a population
2. Normal distribution- the bell shaped curve is so common that if a population has
this shape, the measurements are said to follow a norma
Statistics 1200
SP2010 / Form F1
Ries
100 points
Exam #1
February 22, 2010
Name:_ Student #:_ Rec. sect.: _
Circle the name of your recitation instructor:
Nick
Brown
Na
Hu
Sungwook
(Peter)
Kim
Yang
Li
Xi (Kevin)
Luo
Jacob
Orme
Nil
Sanyal
Chang
Xu
=
Instru
StatsExam3
Chapter16
Probability
The proportion of time that it happens over the long run.
Repeatability
Independence
Personal Probability Assessment
A subjective probability assessment based on one's own knowledge and experience.
used for One-time events
Experiments and Observational Studies
Example: WB5-1 Comparing divorced men to married men
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EXPL: Groups compared = marital status (divorced or married) RESP: Measurement over which the groups are compared = whether or not alcoh
Summarizing Data
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Frequency Distribution It is a table that divides the numbers into categories Histogram A graphical distribution of frequencies Stem-and-leaf display (stemplot) There is one number for every dataset Retains the
Statstics
Z = (Observed score Mean) / standard deviation
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Proportion below z = proportion leess than z = area to left of z = area from table Proportion with z less than 1.88 = .97 = 97% Proportion above z = proportion more than