HOMEWORK 1 SOLUTIONS
PROBLEM SET 1
1. On a 40 question multiple choice exam, Pat got 36 correct. At what percentile of her
class did Pat place? Percentiles cannot be determined without having all of the data or
a distribution of the scores.
2. For each of
CHAPTER 2  BASIC STATISTICAL INFERENCE AND INTERVAL ESTIMATION
I.
Basic Statistical Inference for Population Proportions The Exact Test and the
Normal Approximation to the Binomial
Inference is the process of using specific examples to reach general con
HOMEWORK 1 SOLUTIONS
PROBLEM SET 1
1. On a 40 question multiple choice exam, Pat got 36 correct. At what percentile of her
class did Pat place? Percentiles cannot be determined without having all of the data or
a distribution of the scores.
2. For each of
Matt Tornquist
0026381879
Homework 1
2.a.
b.
c.
Mean: 5
StdDev: 1.66
Mean: 10
StdDev: 2.3
Mean: 15
StdDev: 2.87
Descriptive Statistics: a, b, c
Variable
a
b
c
Mean
5.000
10.00
15.00
StDev
2.739
5.48
8.22
Perfect example of why using tools availible is so
HOMEWORK 2 SOLUTIONS
1. FastenitAll produces wood and metal screws. The screws must be manufactured to
within certain tolerances or they are considered defective. A machine that produces more
than 1% defective screws must be shut down. To test Machine 1
1
CHAPTER 1  INTRODUCTION TO BUSINESS STATISTICS
The science of statistics consists of three main subjects:

Data Analysis (parameter estimation and decision making based on data samples or
collections)

Mathematical Statistics (the development of math
HOMEWORK 2 SOLUTIONS
14. Recall that IQs are distributed N(100, 15).
a. Create a graph showing the probability of a randomly selected person having an IQ less
than 90.
Distribution Plot
Normal, Mean=100, StDev=15
0.030
0.025
Density
0.020
0.015
0.010
0.00
1
CHAPTER 1  INTRODUCTION TO BUSINESS STATISTICS
The science of statistics consists of three main subjects:

Data Analysis (parameter estimation and decision making based on data samples or
collections)

Mathematical Statistics (the development of mat
1
CHAPTER 1 EXERCISES
2. Proctor and Gamble (PG) issues earnings guidance for the 201617 fiscal year stating
that they expect to earn between $3.70 and $4.00 per share of common stock. Based on
this guidance, what is the probability that PG will earn $3.
MGMT 305: Homework 5 (Due: 10/27/2016)
Chapter 8:
Exs. 2, 3, and 4
Chapter 9:
Exs. 2 and 4
Chapter 10: Exs. 3, 6, 7, 11, 13, and 15
CH8
A consumer products researcher randomly surveyed 900 people and asked them if they try to
avoid eating fast food. Of th
HYPOTHESIS TESTING AN INTRODUCTION
Think of hypothesis testing as a way of thought as opposed to a mathematical process. We are
all familiar with this way of thought. Consider the following:
Hypothesis: My car battery is dead.
Test:
a. If my car battery i
MORE HYPOTHESIS TESTING EXERCISES
l. W estWays magazine sampled random ﬂights from LAX and George Bush Airport
(LAH — Houston) to compare their rate of delayed departures. For LAX. 255 of the
895 flights sampled were delayed. for IAH. 302 out of 1256. Tes
MGMT 305
Spring 2015
Midterm I
Wednesday, Feb. 18, 2015
6:307:30
This exam consists of 20 multiple choice questions covering chapters 1
4 of the customized version of the text.
For each question, select the one best answer and mark your choice on
the sc
TWO SAMPLE CONFIDENCE INTERVALS
TwoSample Confidence Intervals for the Difference in Population Proportions

Consider the following problem: An online dating service is conducting a survey to
determine how accurate their online profiles are. They inter
VERSION 1
MGMT 305 Fall 2015 Midterm 2
Wednesday, Oct. 28, 2015, 6:307:30
EE 129 or PHYS 112
NAME:_
Purdue ID:_
This exam consists of 20 multiple choice questions covering Chapters 510a. For each
question, select the one best answer and mark your choice
MORE HYPOTHESIS TESTING EXERCISES
1. WestWays magazine sampled random flights from LAX and George Bush Airport
(IAH Houston) to compare their rate of delayed departures. For LAX, 205 of the
845 flights sampled were delayed; for IAH, 312 out of 1296. Test
MORE HYPOTHESIS TESTING EXERCISES
1. WestWays magazine sampled random flights from LAX and George Bush Airport
(IAH Houston) to compare their rate of delayed departures. For LAX, 255 of the
895 flights sampled were delayed; for IAH, 302 out of 1256. Test
MULTIPLE REGRESSION SAMPLE PROBLEMS
Consider the SAT data we have seen in class and that you worked with (or will work with) in
Homework 7. Below is an excerpt of the entire dataset, which is uploaded in Course Content (without the
Verbal and Math variabl
1
CHAPTER 1 EXERCISES
1. On a 40 question multiple choice exam, Pat got 32 correct. At what percentile of her
class did Pat place? Explain your answer.
2. Proctor and Gamble (PG) issues earnings guidance for the 201617 fiscal year stating that
they expec
56. a.
18
16
14
y
12
10
8
6
4
2
0
0
5
10
15
20
25
x
b.
Positive relationship
c/d. xi = 80
x=
80
= 16
5
( xi x )( yi y ) = 106
=
sxy
yi = 50
y=
50
= 10
5
( xi x ) 2 = 272
( yi y ) 2 = 86
( xi x )( yi y ) 106
= = 26.5
n 1
5 1
=
sx
( xi x ) 2
=
n 1
272
=
MULTIPLE REGRESSION — SAMPLE PROBLEMS
Consider the SAT data we have seen in class and that you worked with (or will work with) in
Homework 7’. Below is an excerpt of the entire dataset, which is uploaded in Course Content (without the
Verbal and Math vari
QUIZ 2 VERSION 2
1. Suppose it is unknown what proportion of employees at ItsaLiving are happy with their job. If
we randomly sample 100 and 55 are happy, using the normal approximation to the binomial to
compute a 90% confidence interval based on this
HOMEWORK 7 SOLUTIONS: MULTIPLE REGRESSION SAMPLE PROBLEMS
(Explanations are not required for full credit.)
Consider the SAT data we have seen in class and that you worked with (or will work with) in
Homework 7. Below is an excerpt of the entire dataset, w
MGMT 305
Business Statistics Fall 2015
Instructor: Dr. Gary Evans
Office: Krannert 528
Phone: (765) 494  4436
Email: evans204@purdue.edu
Office Hours: MWF: 3:30 5:30
Additional office hours will be scheduled for exam review.
Administrative Assistant: Ju
QUIZ 3 Version 2
1. A marketing executive for ALV Automotive Company is evaluating a new television
commercial for their ALV 800 series sedan. He has his team gather data from a focus
group of prospective ALV owners to determine whether or not the commerc
MGMT 305 SAMPLE FINAL EXAM Fall 2014
December 18, 2014 (10:30 am 12:30 pm)
Note. The exam is cumulative: 70% on Regression and 30% on earlier materials.
This sample exam covers only Regression. For earlier materials, focus on the
two old exams and old sam
CHAPTER 2  BASIC STATISTICAL INFERENCE AND INTERVAL ESTIMATION
I.
Basic Statistical Inference for Population Proportions The Exact Test and the
Normal Approximation to the Binomial
Inference is the process of using specific examples to reach general con
HOMEWORK 3 SOLUTIONS
Chapter 3
1. Angus beef cattle weights are distributed N(1156, 84) (in lbs.).
a. If we randomly sample 9 Angus cows, what is the probability that their average weight
will be 1200 lbs. or more? Use Minitab with N(1156, 28) to get: 0.0
MGMT 305
Spring 2015 FINAL EXAM
Monday, May 4, 2015, 10:3012:30
Loeb Playhouse (STEW 183)
NAME: Purdue ID:
This exam is a cumulative exam of 30 multiple choice questions.
For each question, select the one best answer and mark your choice on the scantr
CHAPTER 7  HYPOTHESIS TESTING (contd)
TwoSided (or 2Tailed) Hypothesis Testing

Twosided (or 2tailed) hypothesis testing is a conservative approach to hypothesis
testing. It is used to account for random variation from what is expected in both
dire
CHAPTER 8  HYPOTHESIS TESTING (contd)
TwoSample Testing for Equality of Population Proportions

Like 2sample confidence intervals, 2sample hypothesis testing is used to compare
populations. For us, this will mean that in all 2sample hypothesis test
CHAPTER 13  MULTIPLE REGRESSION (WITH THE NORMAL LINEAR MODEL)
Consider the SAT data we have seen in class and that you worked with (or will work with) in
Homework 6. Below is an excerpt of the entire dataset:
PPS
T/SR
Avg.$
% Takers
Verbal Math Total
A
CHAPTER 14  OneWay Analysis of Variance (ANOVA)
Consider the dataset below in which a number of persons in each of the given
occupations were asked to rate their job satisfaction on a scale of 1 100.
Lawyer
PhysTher
Carpenter
44
55
54
44
42
78
65
73
74
gee ' 4%er
Correlation and Linearity and Gutiiera
'53 Only use linear correlation to interpret the data when
there is a linear relationship
L1 An outlier can strongly inuence the correlation.
p: 3: . H H
2 . ' ' , : rnot useful
ruseful ; not line