MULTIPLE CHOICE and TRUE/FALSE PROBLEMS (6 points each)
WE WILL ONLY GRADE WHATS ON THE ANSWER SHEET (LAST PAGE) FOR MC/TF.
1. The output below gives summary statistics for a dataset of 100 people. The variable Years
measures years of education and Salary
Stat1430
Recitation8
Sections2.12.5,5.1
USEPROPERPROBABILITYNOTATIONTHROUGHOUT!
2.12.4Review
A. Suppose you find X has a strong correlation with Y and the scatterplot shows a strong linear
relationship. Unless the data were collected using a well-designed
Data Collection: Samples and
Surveys
Methods of Collecting Data
Observational Studies (part 1)
Most common observational study: Surveys
Experiments (part 2)
The difference between the two:
Main Objective: Minimize or
Avoid Bias
What is bias?
What is
Data Collection: Samples and
Surveys
Methods of Collecting Data
Observational Studies (part 1)
Most common observational study: Surveys
Experiments (part 2)
The difference between the two:
Main Objective: Minimize or
Avoid Bias
What is bias?
Loading.
What
Data Collection: Experiments
Designing Experiments
What is an experiment?
What makes a good experiment?
Different designs of experiments
Observational studies
An observational study
Observes individuals
Measures variables and makes conclusions,
comp
Data Collection: Experiments
Designing Experiments
What is an experiment?
What makes a good experiment?
Different designs of experiments
Observational studies
An observational study
Observes individuals
Measures variables and makes conclusions,
comparison
Data Displays: Examining Data
Distributions
Big Picture: Organize and summarize your data
set as a first step in data exploration
Organize a data set using graphs
Summarize a data set using numbers
Aka Descriptive Statistics
Keys: knowing which methods to
Public Affairs 6070: Assignment 5
1.
Television Ads: You own a chain of stores that sells television sets and you
want to know whether your advertising is increasing your sales. Let Y be the
number of TVs you sell in a given month, and let X be the amount
Normal Distribution
The Normal Distribution
Type of variable: continuous
Shape bell shaped, symmetric
Center u*x=M
Spread variability, SDx
Picture
68-95-99.7 Rule: rough idea of normal
probabilities
Empirical rule
Finding precise probabilities for a n
Simpson's Paradox
Question and Answer
This assignment is in two parts.
1. In 1987, the Department of Transportation began monitoring the percentage of flights,
for each airline, that arrived on time at 30 of the nations busiest airports. Until people
got
STAT 1430 Midterm 1 Exam Information SP 2014
Midterm 1 is Thursday, February 13, from 7:00 to 8:15 p.m. Rooms to be announced. The
information is posted on Carmen and will be emailed to you.
Midterm 1 will cover everything up through and including Sectio
Stat1430
RecitationProblemSet
Section4.3
1.Whichofthefollowingstatementsisalwaystrue?(Ifallarealwaystrue,selectd)
a.
X+Y=X+Y
b.
XY=X*Y
c.
2X+Y=2X+2Y
d.
Alloftheabovearealwaystrue.
2.
SupposeXisalways3.Then2X=_.
a.3
b.9
c.0
d.Notpossible
3.
IfCorr(X,Y)=0(i
Fisher College of Business
HONORS GENERAL EDUCATION COURSES
This document is to be used as a supplement to FCOB Business Program & General Education Requirements, which outlines
the General Education (Gen Ed) requirements for FCOB students in more detail.
Conditional Probability
Tools so far
Find P(A) - marginal
Given, Use math, Complement Rule
Find P(A and B) - joint, intersection
Multiplication rule (general and special cases)
Find P(A or B) - union
Addition rule (general and special cases)
Find P(A|B) -
Descriptive Statistics and Boxplots
Measure, interpret, compare, measures of
center and variability in data sets.
Center: Mean and Median
Variability: Standard Deviation, Quartiles
Boxplot: Another Graph of Quantitative Data
Golf Scores (18 holes)
Random
Examining Relationships in
Quantitative Variables:
Correlation and Regression
Coffee sales at football games
You are the consessions manager for the
Buffalo Bills
You need to make enough coffee to supply the
demand at the game
How much coffee should you m
Data Collection: Samples and Surveys
Methods of Collecting Data
Observational Studies (part 1)
Most common observational study: Surveys
Experiments (part 2)
The difference between the two:
Observationalstudynoinfluence,just
record
Experimentsmanipulat
STAT 1430 Formula Sheet
This same formula sheet will be attached to all exams. No other review/cheat sheets or other
materials may be used on the exams.
1
=
( )2
1
=
1
(
)(
)
1
= 0 + 1
1 = ( )
0 = 1
=
+ = +
+ = +
2 = ( )2
2
+
= 2 2
2
+
= 2 + 2 +
Data Collection: Samples and
Surveys
Methods of Collecting Data
Observational Studies (part 1)
Most common observational study: Surveys
Experiments (part 2)
The difference between the two:
Observational: no influence, just record
Experiments: manipula
Data Collection: Experiments
Designing Experiments
What is an experiment?
What makes a good experiment?
Different designs of experiments
Observational studies
An observational study
Observes individuals
Without influence
Measures variables and makes
STAT 1430 Case Study #1 Spring 2016 RUBRIC/SOLUTIONS
The questions have been included with these solutions to make them easier to understand. However, the
questions should NOT have been included in student solutions.
1. Suppose you want to collect informa
Normal Distribution
The Normal Distribution
Type of variable: Continuous (x)
Shape Symmetric (mound-shaped or bell-shaped)
Center Mean of x = median, because of symmetry
Spread i.e. variability, standard deviation measures
variability
Picture
68-95-99
Stat 1430
Recitation 7B
Probability Review
Bob thinks more female college students eat breakfast in the morning than males.
Suppose a survey of college students asked whether they ate breakfast this morning or not, along
with their gender. The results are
STAT 1430
Recitation 7A
Conditional Probability
Use the information below to answer #1-#7
28% of Fortune 500 companies are laying off employees. Moreover, 18% of those laying off employees are
cutting down on advertising expenses. Of those companies who a
TABLE A Table entry fat 2 is under the standard nunnal curve to the left Biz.
TABLE A Standard normal probabilities TABLE A Table entry for 2 is under the standard normal 01an In the left of 1.
TABLE A Standard normal probabilities (continued)
116
cfw_L7
STAT 1430
Recitation 12B (SOLUTIONS) Normal Approx/Sample Dist
Show all work. Use the table or normal approx. whenever they are appropriate. When using normal
approx., remember to check all conditions and remember your answer is only an approximation!
1.
STAT 1430
Recitation 12A (SOLUTIONS)
Binomial Distribution
Part 0:
A. What is the value of
( 42)
?
4321 24
= =6
( 42)= 2!42! ! = (21)(21)
4
B. What is the value of
(1615)
?
! 16
= =16
(1615)= 1516! 1! = 1615
15 ! (1) 1
C. If you wish to calculate the prob