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BEYOND THE NUMBERS 2.2
EXHIBIT 1
Texting Error
Title: Poll Finds Support for Ban on Texting at the Wheel
Author: Marjorie Connelly
Source: The New Yor
Final Exam Practice Questions
STA 291
1. A sales manager was interested in determining if there is a relationship between college
GPA and sales performance among salespeople hired within the last year. A sample of
recently hired salespeople was selected t
Sampling Distributions
o Distribution for Sample Mean
Expected Value
Standard Error
o Distribution for Sample Proportion
Expected Value
Standard Error
Population Proportion Estimation
o Point estimate
o Interval estimate
o Z values
90% confidence
9
5/2/2013
STA291
Statistical Methods
Lecture 6
Recall: Quantitative Data
o Units tell how each variable has
been measured
o Interval and ratio
o Discrete and Continuous
Summary of Quantitative Data
o In contrast to what we could do with a
qualitative varia
5/2/2013
STA291
Statistical Methods
Lecture 4
Probability
o Abstract but necessary because this is the
mathematical theory underlying all statistical inference
Probability
Population
Sample
(Inferential) Statistics
o Fundamental concepts that are very imp
5/2/2013
STA291
Statistical Methods
Lecture 5
Disjoint Sets
Let A and B denote two events.
Disjoint (mutually exclusive) events: A and B are
said to be disjoint if there are no outcomes
common to both A and B.
The notation for this is written as A B
Note
5/2/2013
STA291
Statistical Methods
Lecture 7
Numerical Summary of Quantitative Data
o Given a sample of quantitative data, we
started by summarizing using a frequency
distribution
oWe then looked at the graph &
considered
oC
oV
oD
oO
o(T)
Mean (Average)
5/2/2013
STA291
Statistical Methods
Lecture 3
Why do we (usually) provide graphs?
Recall: Categorical or Qualitative Data
o Nominal variables have a scale of
unordered categories
o Nominal examples : gender, nationality,
hair color, state of residence
o F
1/23/2014
STA291
Statistical Methods
Lecture 9
Box Plot (AKA Box-and-Whiskers Plot)
A box plot is basically a graphical version of the
five-number summary (unless there are
outliers)
o It consists of a box that contains the central
50% of the distribution
1/30/2014
STA291
Statistical Methods
Lecture 11
LINEar Association
or
measures closeness of data to the best
line. What line is that? And best in what
terms of what?
o In terms of least squared error:
Best line: least-squares, or
regression line
Observed
5/2/2013
STA291
Statistical Methods
Lecture 8
Numerical Summary of Quantitative Data
o Were up to the V of CVDO(T):
VARIABILITY
Range
o Range:
Difference between the largest and
smallest observations
o Very
much affected by outliers (one
misreported obser
1/24/2014
STA291
Statistical Methods
Lecture 10
Measuring something over time
o Like
o
a companys stock value:
It kind of just sits there, making your eyes glaze over.
And even though were measuring one variable (of
interest), we need to look at two varia
2/14/2014
STA291
Statistical Methods
Exam 1 Review
Exam 1
o Tuesday, February
18th from 5PM 7PM.
o Location: Chemistry-Physics Building
room 139 (for sections 001-006).
o Alternate
exam: Tuesday, February 18th
from 7PM 9PM. Location TBA. I need
to see a c
5/2/2013
STA291
Statistical Methods
Lecture 1
Why Statistics?
What is Statistics?
1
5/2/2013
What are (?) data?
cases: about whom or what we
record some characteristics.
variables: the characteristics
recorded about each individual or
case are called
Type
STA291
Test 2
_
_
Name
Instructo
r
ID
_
_
_
Section (or lab
time)
_
_
Test Section Number
Score
Correct
Multiple/12
choice
Fill-in-the-blank
Show-your-work
(paint problem is 10 pts.)
/36
/36
/9
/9
/10
Total
/100
Formulas (more on back)
For any problem inv
Instructions on OLD tdist and tinv Excel functions:
TDIST(RIGHT t, Degrees of freedom, Number of tails): to find p-values
The thing to remember about this function is that it is set up to always give the right-tail
probability of a positive number entered
Practice Exam 2 Solutions
Multiple Choice
1) B
2) B
3) C
4) D
5) A
6) B
7) D
Fill-in-the-blank
1) H0: =70, HA: > 70
2) Normal
3) 97
4) True.
5) 461
6) Type II
7) Accept
Show-your-work
1) (.685, .815)
2) H0: = 15, HA: < 15
We reject H0 if T.S. < t24, 0.05
Multiple Choice
1) In testing the hypotheses H0: p = 0.40 vs. H1: p > 0.40, at the 5% significance level, if the
sample proportion is .45, and the standard error of the sample proportion is .035, the
appropriate conclusion would be:
a)
to reject H0
b)
not
STA291
Test3
Formulas
Foranyprobleminvolvinganydistributionprobabilityorquantile(binomial,normal,t,
chisquare,orF),anacceptableanswerwillbetheExcelfunctioncalltoevaluateit,whether
thequestionspecifiesthisornot.
frequency
n
relative
1 P A
P A P B P A B
P
JEOPARDY ANSWERS
TEST STATISTICS
Slide 1: Test for the difference between two population means
Slide 2: Test for the difference between two population proportions
Slide 3: Test for the regression slope
Slide 4: One-way ANOVA
Slide 5: Chi-square test
NAME
Multiple-choice answers
1) b. In a one-way ANOVA, the variation that is explained is the variation due to the treatments
(a), and (c) is the sum of both the treatment SS and the error SS. The degrees of freedom have
nothing to do with variation.
2) b. A f
DISCLAIMER: This practice exam is intended to only supplement your studying of the
new material for the final exam. It is neither meant to be taken as a guarantee as to what
material will be on the exam, nor is it meant to replace other forms of studying
5/2/2013
STA291
Statistical Methods
Lecture 2
Common Language
o
Population
o
Sample
o
Sampling Frame
o
Census versus census
o
Parameter
o
Statistic
Example
University Health Services at UK conducts a survey about
alcohol abuse among students. Two-hundred
1/31/2014
STA291
Statistical Methods
Lecture 12
Random Variables
A variable X is a random variable (r.v.) if the
value that X assumes at the conclusion of an
experiment cannot be predicted with
certainty in advance.
o There are two types of random variabl
2/20/2014
STA291
Statistical Methods
Lecture 15
Chapter 10: Sampling Distributions
X
Population with
mean and
standard
deviation
X
X
X
X
X
X
X
X
If you repeatedly
take random
samples and
calculate the sample
mean each time, the
distribution of the
sampl
Name_Sect_
Exam 1 Study Guide:
There are 10 statistical benchmarks you should know, what are they? (These are on page 9 of
your workbook)
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Definitions: (These are in the videos and page 11 and 13 of the workbook)
Confounding: