STAT 312: Statistical Methods for Engineers
Homework #4 Solutions
1.2: 8 It increases the mean and does nothing to the standard deviation (ie adding a
constant)
1.2: 12
a.
tapply(ex1.2.12$cir, ex1.2.1
STAT 312: Statistical Methods for Engineers
Homework #1 Solutions
1. Use a fair coin to generate the children for 10 families. Record the number of families
with two boys, two girls, and one of each.
STAT 312: Statistical Methods for Engineers
Homework #2 Solutions
4.5: 4
a. P (X 2) = 1 P (X 2) = 1 0.50 = 0.50 note this is the mean
b. P (1 X < 7) = P (X < 7) P (X < 1) = 0.7107426 0.4557641 = 0.254
STAT 312: Statistical Methods for Engineers
Homework #3 Solutions
1.1: 2
i. They might be taller than usual; probably the worst
ii. They are only students from one of the 6 colleges (here at CP), the
PROBABILITY AND STATISTICS FOR ENGINEERS AND SCIENTISTS
STAT 321

Fall 2009
Investigation 9: More Battery Lifetimes
Please work with one or two other people on this, handing in one report with all
names. You will submit the report via PolyLearn according to the due date liste
PROBABILITY AND STATISTICS FOR ENGINEERS AND SCIENTISTS
STAT 321

Fall 2009
Example: German Tank Problem
During World War II, Allied Intelligence (the spies) gave reports on the production of tanks and
other war materials that varied widely and were somewhat contradictory. In
PROBABILITY AND STATISTICS FOR ENGINEERS AND SCIENTISTS
STAT 321

Fall 2009
Due:
Investigation 5: Ice Cream Prices
Please work with one or two other people on this, handing in one report with all
names. You will submit the report via PolyLearn according to the due date listed
PROBABILITY AND STATISTICS FOR ENGINEERS AND SCIENTISTS
STAT 321

Fall 2009
a) Work with a partner (who may or may not be a student in this class) to look through
the American Film Institutes Top 100 list of American films
(http:/www.afi.com/100years/movies10.aspx). Keep trac
PROBABILITY AND STATISTICS FOR ENGINEERS AND SCIENTISTS
STAT 321

Fall 2009
Investigation 7: Heart Transplant Mortality
Please work with one or two other people on this, handing in one report with all names. You
will submit the report via PolyLearn according to the due date l
PROBABILITY AND STATISTICS FOR ENGINEERS AND SCIENTISTS
STAT 321

Fall 2009
Investigation 8: Sampling without Replacement
Please work with one or two other people on this, handing in one report with all
names. You will submit the report via PolyLearn according to the due date
PROBABILITY AND STATISTICS FOR ENGINEERS AND SCIENTISTS
STAT 321

Fall 2009
Investigation 1: Reducing Back Pain
A study published in the journal Neurology examined whether the drug botulinum toxin A is
helpful for reducing pain among patients who suffer from chronic low back
PROBABILITY AND STATISTICS FOR ENGINEERS AND SCIENTISTS
STAT 321

Fall 2009
Investigation 3: Simpson's Paradox
Please work with one or two other people on this, handing in one report with all
names. You will submit the report via PolyLearn according to the due date listed on
Homework 6
See syllabus for guidelines for completing and submitting homework. All textbook exercises are
from Utts, Seeing Through Statistics, 4th edition.
This homework is worth 12 points.
1. (1pt)
Homework 7
1. (1pt.) In the study conducted by Onur Gntrkn, what percentage of couples leaned their
heads to the right?
80/124= 64.5% of couples leaned their heads to the right while kissing.
2. (2pt.
Homework 5
1. [1] For each of the following cases, would the mean or the median probably be higher, or
would they be about equal? Explain.
a. Salaries in a company employing 100 factory workers and tw
Homework 2
1. [1.5] Suppose that the participants in a study are oppositesex couples married in CA in 2015.
For each of the following, indicate whether it can legitimately be considered (1) a categor
Homework 3
2. [2] Suppose you were interested in the average age of firsttime moms for all countries in the
world. To answer your research question you decided to collect some data using a specific
s
Homework 1
1) a) The study was a randomized experiment because the patients were divided randomly into
two groups. The study was an experiment because they imposed the variables.
b) Yes, it is a causa
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STAT 323/523: DESIGN & ANALYSIS OF EXPERIMENTS I
SPRING 2017
Some things to study for the Final Exam
Studying for the Final Exam: You should review all of your notes, review the homework problems, rev
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