Stat 23400
Winter 2013
HW #9
Due Friday March 15th at 1.30PM (box outside Ryerson 161A)
No late assignments accepted after this time
Staple your pages together in question order.
Include your full name (no nicknames), section number (01, 02, or 03), and
Stat 23400
Autumn 2004
Homework 3 Solutions
1. (9 total points) Textbook Problem 2.19 on page 66
Suppose that the IRS examiner of Exercise 2.12 correctly detects and ags 90% of all erroneous
returns that he reviews. In addition, he mistakenly ags 2% of c
Stat 23400
Autumn 2012
HW #4 Solution, Section 03 (TuTh)
1. (10 total points) Textbook Exercise 2.30 on page 68. Show your work for full credit.
Consider the following function.
f (x) = P (X = x) =
1
,
x(x + 1)
x = 1, 2, .
(a) Show that f (x) is a p.m.f.
Stat 23400
Autumn 2012
HW #4 for Section 03
Due by 3:30pm FRIDAY, November 2nd in the box outside Eckhart 107
Edit, organize, and clearly label any computer output. Most of the points on any computer
portion are for your comments and conclusions about the
STAT23400, Winter 2013 Homework 2 Solutions
Yuxue Qi, Danna Zhang, Matthew Reimherr
Total: 93 points
1. (12 total points) Textbook Problem 3.2 on page 101.
In each of the following instances (i) tell whether the study is experimental or observational,
(ii
Mean
Statistical Models/Method-1 STAT23400
Lecture 2
The mean of a set of observations is the arithmetic average of
the observations:
n
x=
Coverage:
4.3.1 Measures of locations: mean, median, trimmed
mean
4.3.2 Measures of dispersion: quartiles, range, IQ
Stat 23400
Aut 2012
HW #8 for Section 03
DUE BY 3:30pm WEDNESDAY, DECEMBER 5
Turn in at the box outside Eckhart 107.
This HW#8 touches on material discussed in lectures on November 22nd, 27th, and 29th:
Sections 6.1-6.3, 7.1-7.2 and 8.1 (omit any starred
> # 7 (7.16)(a) We need to check the box plot and the normal plot for the data to see
if both plots are satisfactory and no outliers are present. Outliers, if there are any,
should be more closely examined to check if they can be explained or if they can
> # 4. (4.21) (a) Generate 10000 random samples of size n = 5 from an N(10,3^2)
distribution
> nsim = 10000
>n=5
> sigma2 = 9
> mysamples = matrix(rnorm(nsim*n, m=10, s=sqrt(sigma2), nrow=nsim, ncol=n)
> # Calculate S^2 for each sample and standardize the
Stat 23400
Aut 2012
HW #7 for Section 03
DUE BY 3:30pm THURSDAY, NOVEMBER 29
Turn in at 10:30am at lecture or later in the afternoon in the box outside Eckhart 107.
This HW#7 touches on material discussed in lectures on November 20th, 22nd, and 27th:
Sect
Stat 23400
Aut 2012
Solution: HW #6, Sect 03
1. (6 total points) Lets reconsider Question #3 from Homework #4 about observing X, the
number of Model A laptops that break down out of 10 at small company. Suppose that we do
not know the value of p (the prob
Stat 23400
Aut 2012
HW #6 for Section 03
DUE (STAPLED WITH HW #5) BY 3:30pm TUESDAY, NOVEMBER 20
Turn in at 10:30am at lecture or later in the afternoon in the box outside Eckhart 107
This HW#6 touches on material that we discussed in lectures on November
Stat 23400
Aut 2012
Solutions: HW #5, Sec 03
1. (10 total points) Textbook Exercise 2.42 on page 71. Show your work for full credit.
In addition, answer the following questions:
(d) Draw a graph of the cumulative distribution function. You can draw this g
Stat 23400
Aut 2012
HW #5 for Section 03
DUE BY 3:30pm FRIDAY, NOVEMBER 16 (in the box outside Eckhart 107)
This is Version 2.0 of HW #5, posted on Chalk at 3:15pm on Tuesday, November 13th.
A student pointed out the mathematical diculty of parts (d), (e)
Stat 23400
Autumn 2012
HW #3 for Section 03
Due 3:00pm Thursday, October 25th at Eckhart 107
(or at the Thursday, October 25th 10:30am lecture period)
Edit, organize, and clearly label any computer output.
Most of the points on any computer portion are fo
Business 320, Summer 1999, Midterm
Solutions
name _
There are three questions.
Each part of each question is worth 2 points.
You may use a calculator and one cheat sheet.
#1, 6 parts (out of 12)_
#2, 10 parts (out of 20)_
#3, 10 parts (out of 20)_
Variabl
Business 320, Final Exam, Summer 99, Solutions
Name_Rob McCulloch_
You are reminded that it is assumed that all work will be your own.
The contents of the exam are confidential.
Do not discuss them with anyone until final grades are reported.
You have 3 h
Final Exam Business Statistics
Winter 2002
Solutions
True False
1. False. If we reject at the 5% level then all we know is that the p-value is smaller
than 5%.
2. True.
3. False. The cdf is a probability and therefore must be between 0 and 1.
4. True. (as
Midterm Exam Business Statistics Solutions
Winter 2002
Russell
T/F Questions
1. True. From the definition of the covariance.
2. True. The covariance terms is zero since X and Y are independent.
3. True. The histogram will have 100% weight on a single valu
Business 320, Final Exam, Spring 99
Name_
You are reminded that it is assumed that all work will be your own.
You have 3 hours.
You may use two cheat sheets and a calculator.
Each part of each question is worth two points.
q1, 6 parts, 12 points_
q2, 5 pa
Business 320, Final Exam, Spring 99
Name_
You are reminded that it is assumed that all work will be your own.
You have 3 hours.
You may use two cheat sheets and a calculator.
Each part of each question is worth two points.
q1, 6 parts, 12 points_
q2, 5 pa
Name_
Final Exam Bus 320
Spring 2000
Russell
Do not turn over this page until you are told to do so. You will have 3 hours minutes to
complete this exam. The exam has a total of 100 points and is divided into three parts.
The true and false questions are
Stat 23400
Autumn 2012
HW #1 Assignment
The due date varies according to the section you are enrolled in as follows:
Section 01: 11:30am Friday, October 12th in class (at the beginning of the lecture period)
Section 02: 2:30pm Friday, October 12th in cl
STAT23400, Autumn 2012 Homework 1 Solutions
Subhajit Goswami, Mengyu Xu, Joelle Mbatchou
Total: 90 points
1. (11 total points) Textbook Problem 4.2 on page 150.
Information collected to compare new car models includes engine size in liters, number of cyli
STAT23400, Autumn 2012 Homework 2 Solutions
Yibi Huang
Total: 100 points
1. (12 total points) Textbook Problem 3.2 on page 101.
In each of the following instances (i) tell whether the study is experimental or observational,
(ii) tell whether the study is
Stat 23400
Aut 2012
HW #3, Sec 3, Q#9 Solution
1. During the October 16th and 18th lectures, we spent time examining the results of a comparative experiment published in the Journal of Personality and Social Pyschology (Butler and
Baumeister, 1998). The s
Midterm Solutions Bus 320
Winter 2001
Russell
I.
True or False
1. T
Since X1 and X2 are independent, Var( X1 - X2 ) = Var( X1 ) + Var( X2 ) = 2 2
2. T
a must be -.5 so that 0.5 so that the area under the pdf equals to 1.
3. F
A conditional Probability mus
STAT23400 R-Help for Homework 1
Since this is our rst data set in R, all of the necessary R commands are outlined below. In the
future, you can use this as a template for working with data les.
You may want to open a document (e.g., Microsoft Word or TXT)
Random Variables
Random Variable:
A random variable (r.v. ) is a numerical description of the
outcome of a random experiment. Essentially, a r.v. is a function
from the sample space to the real numbers:
X : S R.
Example: Let X= # of girls in a randomly ch