a. The average (mean) annual income was greater than $45,000.
Distribution Plot
Normal, Mean=0, StDev=1
0.4
Density
0.3
0.2
0.1
0.05
0.0
0
X
1.645
One-Sample Z
Test of mu = 45 vs > 45
The assumed standard deviation = 13.88
N
50
Mean
46.02
SE Mean
1.96
95%
1.
Generate a scatterplot for income ($1,000) versus credit balance($), including the graph of the best
fit line. Interpret.
Income and Credit balance have a positive linear relationship, as credit balance increases income also
increases. For the most par
A. This data set of AJ Davis customers was analyzed based upon several factors. Location,
analyzing where the majority of AJ Daviss customers is coming from is helpful in trying to
create strategy for the company to remain successful, and continue to attr
MATH 221 Statistics for Decision Making
Week 4 iLab
Name: _ _
MATH221
Statistical Concepts:
Probability
Binomial Probability Distribution
Calculating Binomial Probabilities
Open a new Excel worksheet.
1.
2.
3.
4.
5.
Open spreadsheet
In cell A1 type suc
1
MATH 221 Statistics for Decision Making
Week 2 iLab
Name:_ _
Statistical Concepts that you will learn after completing this iLab:
Using Excel for Statistics
Graphics
Shapes of Distributions
Descriptive Statistics
Empirical Rule
Week 2 iLab Instruct
MATH 221 Statistics for Decision Making
Week 6 iLab
Name:_ _
Statistical Concepts:
Data Simulation
Confidence Intervals
Normal Probabilities
Short Answer Writing Assignment
All answers should be complete sentences.
We need to find the confidence interv
Excel Tutorial
Revised July 2003
Tutorial 2:
Drawing A Line Using Excel Formulas
NOTE: My Toolbars will look different from yours because I added a lot of custom buttons!
For technical help at all times, click on the HELP icon
and type in your question.
Tutorial 1:
Drawing A Straight Line Through 2 Points
NOTE: My Toolbars will look different from yours because I added a lot of custom buttons!
For technical help at all times, click on the HELP icon
and type in your question. While I can guide you throug
Factoring Summary - if this were a f-2-f class, these are the examples
we would work on the board. Therefore, I strongly urge you to copy each of them
by hand and then use it as a guide when you practice, practice, practice.
Type 1: All three terms have p
To find LCD of two expressions you must factor both expressions first.
Then you must use all of the factors.
You use each factor the most number of times it occurs in either one of the expressions.
2a2 + 4a + 2
= 2(a2 + 2a + 1)
= 2(a + 1)(a + 1)
= 21(a +
Quadratic formula.
Suppose you want to solve a quadratic equation (youll recognize it because it will have an x 2 as
the highest degree).
In standard form it looks like this ax2 + bx + c = 0
This formula will ALWAYS work. Some people prefer to factor and
How to Eliminate Fractions in Linear Equations
By Ursula Feuerecker for DeVry University
Solve by eliminating fractions:
5 2
3
1 x
x x
12 3
4
2
Solution:
5 2
3
1 x
x x
12 3
4
2
5 2x 3x (1 x)
12 3
4
2
Step 1: Write each term as a "true" fraction
Step 2:
AJ Davis Department Stores
Project Part B: Hypothesis Testing & Confidence Interval
Natalia Hernandez
MATH 533: Applied Managerial Statistics
Keller School of Management
DeVry University
June 12, 2016
Four questions have been postulated to help in the stu
AJ Davis Department Stores
Project Part C: Regression Analysis
Natalia Hernandez
MATH 533: Applied Managerial Statistics
Keller School of Management
DeVry University
June 19, 2016
PART A: Analysis
In an effort to identify the key variables that will help
AJ Davis Department Stores
Project Part A: Exploratory Data Analysis
Natalia Schwark
MATH 533: Applied Managerial Statistics
Keller School of Management
DeVry University
May 15, 2016
A. Brief Introduction
AJ Davis, a largely recognized department store ha
Project Part C:
Regression and
Correlation Analysis
Using MINITAB, perform the regression and correlation analysis for the data on income(Y), the dependent variable, and creditb
1.
Generate a scatterplot for income ($1,000) versuscreditbalance($), includi
PART B
Your manager has speculated the following.
a. The average (mean) annual income was greater than $45,000.
b. The true population proportion of customers who live in a suburban area is less than 45%.
c. The average (mean) number of years lived in the
Final Review Question 1
In a survey of 9000 dog owners, 5400 say they walk their dogs at
least once per week. Construct a 95% confidence interval of the
population proportion of dog owners who walk their dogs at least
once per week.
Answer
In Minitab, Go
Confidence
P
Error
90
0.833 (Use 0.5 if Unknown, if a fraction type = 1/6 for 1/6 etc.)
0.04
Z Value
1.645 Don't enter anything here, it is for formula
Sample Size
236
e = 1/6 for 1/6 etc.)
90
1.645
95
1.96
99
2.575
Don't fool with these
First find the pr
Chowdhury 1
The Seven elements of a Test of Hypothesis are:
1. Null Hypothesis - A theory about the specific values of one or more
population parameters. The theory generally represents the status quo, and
we accept it until proven false.
2. Alternative (
1. A study of n=120,000 first-time candidates for an exam found that the number of semester hours of
college credit taken by the sampled candidates is summarized by x=148.59 and
s=17.45.
A professor claims that the true mean number of semester hours of co
Week 6 Quiz
1.A MINITAB printout relating the size of the diamond (number of carats) to the asking price (dollars) for
308
diamonds is shown below. Complete parts a through e.
The regression equation is
PRICE=2297+11590
CARAT
Predictor
Coef
SE Coef
T
P
Co
Course Project Part C
Course Project Part C
Regression and Correlation Analysis
1
Course Project Part C
1. Generate a scatterplot for INCOME ($1000) versus CREDIT BALANCE ($),
including the graph of the best fit line.
Each point in the scatter plot repres
Suppose data collected by observers at randomly selected intersections across the country revealed that
in a sample of 80 drivers, 48were using their cell phone.
a. Give a point estimate of p, the true driver cell phone use rate (that is, the true proport
Math 533
Course Project- Part A
A) Introduction
The data set provides information regarding 50 customers who were selected by AJ
Davis, for data collection based on the following variables: income, family size, and years in
current residence and credit ba
Course Project Part B
Course Project Part B
Hypothesis Testing and Confidence Intervals
Professor Se Kim
1
Course Project Part B
The AJ Davis manager has speculated certain factors. We will consider the elements
of the test hypotheses when determining our
1. 2.
3
Suppose 80% of kids who visit a doctor have a fever, and 10% of kids with a fever have sore
throats. What's the probability that a kid who goes to the doctor has a fever and a sore throat?
The general multiplication rule for compound events is giv
1. Health care workers who use latex gloves with glove powder on a daily basis are particularly susceptible to
developing a latex allergy. Each in a sample of 43 hospital employees who were diagnosed with a latex allergy based
on a skin-prick test reporte
MATH533
Course Project: Part A Exploratory Analysis
A. Introduction
The department store, AJ DAVIS, wishes to know more about their large amount of credit
customers. A sample of 50 credit customers has been provided, along with data in 5 different variabl