12.60ac
a) Y-hat = -8.93+.70x-.0034x^2
Student Edition of Statistix 10.0
AM
BLKFRI.sx, 4/7/2016, 11:42:45
Least Squares Linear Regression of YEARS
Predictor
Variables
Constant
AGE
AGESQ
R
Adjusted R
AICc
PRESS
Coefficient
-8.93316
0.70386
-3.412E-03
0.429
12.116abcd
a) 4
b) 3
c) X1 = Gender, X2= Body Satisfaction, X3= Impressions reality TV.
d) No. Large number of t-test (inflated type 1 error). No interaction or high order terms fit.
Stepwise Linear Regression of DESIRE
Unforced Variables: GENDER SELFESTM
11.20 ABC
A) Positive linear trend
Scatter Plot of CONVICTS vs FEMARELF
CONVICTS
90
60
30
0
0
100
200
300
FEMARELF
B) 29.6-.147x
Least Squares Linear Regression of CONVICTS
Predictor
Variables
Constant
FEMARELF
Coefficient
29.5835
0.14720
R
Adjusted R
AIC
Experimental Unit = Baseball Pitchers
Dependent Variable: Y = Earned Run Average (average)
QN Independent Variable: X1 = Ks (number of Strike Outs)
QL Independent Variable: Throws, X2 = cfw_1 if Left, 0 if right
Source: ESPN MLB Stats
http:/espn.go.com/ml
Problem 1:
a)
b)
c)
d)
e)
f)
All voters in the U.S.
Job performance ( Qualitative )
2,000 individuals
Is the president doing a good or bad job
Random survey by phone
Yes it would be representative because its randomized
Problem 2:
a) Interval: 1.79-4.43
b
CHAPTER NINE
HYPOTHESIS TESTS
MULTIPLE CHOICE QUESTIONS
In the following multiple choice questions, circle the correct answer.
1.
In hypothesis testing, the tentative assumption about the population parameter is
a. the alternative hypothesis
b. the null h
QMB 3200
Homework #8
*
Instructions: Solve all the problems. Problems #1, #3, and #4 carry 20 points each.
Problems #2 and #5 carry 10 points each. Maximum score possible for this Homework is 80
points.
Note: Use EXCEL as appropriate. Using Excel will sav
QMB 3200
Homework #5
*
Instructions: Solve all the problems. Each problem carries 20 points. Maximum score
possible for this Homework is 80 points. When both p-value and critical-value approaches
are asked, you have to use both as points are allocated to
QMB-3200: Business and Economic Statistics II
SAMPLE QUIZ #5
1.
The mathematical equation relating the expected 6.
value of the dependent variable to the value of
the independent variables, which has the form of
E(y) =
is
a. a simple linear regression mod
Source of
Variation
Degrees of
Freedom
Sum of Squares
Mean Square
F
P-Value
F
P-Value
Mean Square
F
P-Value
7.25
.3448
MSTR=
Treatment
k-1
SSTR
Error
nT -k
SSE
Total
nT -1
SSTR+SSE=SST
MSE=
1) Chapter 13 Part A)
Source of
Variation
Degrees of
Freedom
Sum
Forecasting -1
Those who do not remember the past
are condemned to repeat it
George Santayana (1863-1952)
Spanish philosopher, essayist, poet
Chapter 7
and novelist
Demand Forecasting
in a Supply Chain
Ardavan Asef-Vaziri
6/4/2009
Moving Average 1
Forecas
QMB-3200: Business and Economic Statistics II
Sample Exam #2
Max. Score: 60 points
Duration:
2 Hours
Instructions:
1. All the questions must be answered. The exam is for a total of 70 points (however, maximum
score you can get is 60 points).
2. Presenting
QMB-3200: Business and Economic Statistics II
Sample Exam #3
Max. Score: 60 points
Duration:
2 Hours
Instructions:
1. Exam is for a total of 65 points. However, maximum you can score is 60 points.
2. Short and Crisp answers are sufficient. No need for ela
QMB 3200
Homework #9
*
Instructions: Solve all the problems. Each problem carries 20 points. Maximum score
possible for this Homework is 80 points.
Note: Use EXCEL as appropriate. Using Excel will save you a lot of time. You can type in
your answers to qu
Problem 1:
Estimate of Annual Maintenance Expense (in $1000s) = 10.3350 + 0.9586 * Weekly Usage (in Hrs)
a)
b) and c)
Alpha =
0.05
numerator
d.f.
denominator
1
8
Hypotheses for Significance of Regression:
H0: Beta1 = 0
Relationship between Weekly Usage an
QMB3200 - HW #6 Solution
Problem 1:
H0:
Ha:
1 = 2 = 3 (All treatments have the same mean responses)
Not all Treatments means are equal (At least one of the three treatments has a different mean than others)
Source of Variation
Sum of Squares
d.f.
Treatmen
QMB 3200
Homework #4
Il*iiill*
mm: Solve all the problems. Each problem carries 10 points. Maximum score
possrble for this Homework is 80 points.
I) No need for typing. You can do your work by hand on paper.
2) If you use a regular A-4/Letter Size (8.5x
The era of Big Data is here,
and business schools must
expose raduates to the skills
that to ays analyticsbased
organizations are lookin for.
Heres what we need to o.
BY HUGH .I. WATSON
e all have transformational moments where we
change our perceptions
1
Chapter 8 - Interval Estimation Problems
2. A simple random sample of 50 items from a population with = 6 resulted
in a sample mean of 32.
a. Provide a 90% confidence interval for the population mean.
b. Provide a 95% confidence interval for the populat
This is a Binomial Distribution problem.
First, the outcomes can be classified as success(workers take public transportation) and
failure(workers do not take public transportation).
Next, we are given that Pr(success) = .3 while Pr(failure) = .7
1) We hav
QMB 3200
Homework #3
*
Instructions: Solve all the problems. Each problem carries 10 points. Maximum score
possible for this Homework is 40 points.
Due: Attach your report on Canvas before 11:59 p.m. Wednesday, February 4th.
Additional Suggestions/Instruc
QMB3200 - Homework #2 - Solution
Problem 1:
a.
# of times
SAT is
taken
1
2
3
4
5
b.
# of
Students
x
1
2
3
4
5
0.475
0.396
0.110
0.015
0.004
Total 1,518,859
Total
d.
e.
xf(x)
f(x)
721,769
601,325
166,736
22,299
6,730
c.
f(x)*(xmu)^2
0.396
0.110
0.015
0.004
Source of
Variation
Degrees of
Freedom
Sum of Squares
Mean Square
F
P-Value
F
P-Value
Mean Square
F
P-Value
7.25
.3448
MSTR=
Treatment
k-1
SSTR
Error
nT -k
SSE
MSE=
Total
nT -1
1) Chapter 13 Part A)
Source of
Variation
Degrees of
Freedom
SSTR+SSE=SST
Sum
QMB 3200 HW #5 Solution
Problem 1:
1
Problem 2:
2
Problem 3:
with mean, = 2.8
with mean, = 2.8
with mean, = 2.8
with mean, = 2.8
3
Problem 4:
with mean, np = 1.0 and variance, np(1-p) = 0.75
with mean, np = 1.0 and variance, np(1-p) = 0.75
with mean, np =
QMB 3200
Homework #6
*
Instructions: Solve all the problems. Each problem carries 20 points. Maximum score
possible for this Homework is 140 points. When both p-value and critical-value approaches
are asked, you have to use both as points are allocated to