Practice Problems for Stat 112 Midterm I
I. Multiple choice
The following three questions refer to the following data. Asking prices were collected
from a random sample of classified advertisements for used Honda Accords being offered
for sale in the spri
The impact of economic growth on the outcome of U.S. presidential elections has been studied by Ray C.
Fair in Predicting Presidential Elections and Other Things, Stanford University Press, 2002. For the
following analysis the response variable is the pro
Statistics 112 Spring 2016
Practice Exam
Allotted Time = 90 minutes
You should bring a page of notes for the exam and a calculator. (Except for this
page of notes the exam is closed book.)
Statistical tables
Review Problems
Stat 112
2016
Part 2: Multiple regression, ANOVA, etc.
1.
A study was performed to help determine the fair, market value for office rental
space in major Mid-western cities. A random sample of office rentals in this area was
investigated.
Homework 3- Solutions
Stat 112
Spring 2016
Chapter 3:
20.
a. Average In-State tuition = $11,600
Average log(In-State) = 8.6606
Log (Average In-State Tuition) = log(11,600) = 9.3588
The log of the average is not the same as the average of the logs: 9.3588
Review Problems with Solutions
Stat 112
2016
Part 1: Two sample tests and ordinary regression
1.
Suppose Reebok released a new sneaker that they claim to be substantially more durable
than Nike's top selling sneaker. Nike, obviously upset by this, categor
Chapter 4
Problem #31
The distribution of data appears non-normal after examination in a histogram, even after an
attempted transformation to log(Survival). The Wilcoxen rank-sum test is appropriate after an
examination of the data. The rank-sum test give
D
(1)Welldesignedopinionpollsusuallyreportamarginoferroralongwiththeirestimates(e.g.,53%
approveofthejobPresidentObamaisdoing,with3%marginoferror).
(a)Whyisamarginoferrornecessary?Thatis,whydothepollsnotsimplyreportthat53%approveofthe
jobPresidentObamaisd
Chapter 1: # 16, 17, 18
16
a)
Homework #1 Solutions
Stat 112 Spring 2016
b) There are several differences between the two displays. For example, Display
1.11 includes the sample size (n = 228), while the above box p
Homework Six Solutions
Stat 112
Spring 2016
Chapter 7 (#24, #26):
24.
(a) The following least squares fits are consistent with the estimates and standard errors
given in the textbook:
(b)
Denmark: t-statistic = -2.07
Netherlands: t-statistic = -5.71
Canad
Statistics 112 Spring 2016
Practice Exam
Allotted Time = 90 minutes
You should bring a page of notes for the exam and a calculator. (Except for this
page of notes the exam is closed book.)
Statistical tables
The 2000 U. S presidential election was very closely contested, and resolution of the outcome was delayed
until it could be declared whether George Bush or Al Gore had captured the Florida electoral votes. In
addition to Bush and Gore, there were eight ot
Data were collected in August 2005 from the Honda web site showing prices of certified preowned
Accords, all available for purchase. The data give the price of the vehicle, its age in years, the odometer
reading , the specific Accord model, and whether or
Practice Problems
I. Time Series
A. Basic setup of time series
Time-series data are data that are gathered on a single individual (person, firm, and so on)
over a sequence of time periods, which may be days, weeks, months, quarters, years, or virtually
an
1. For a city with Vacancy rate 10 per cent and Unemployment rate 8 per cent, the average cost of rental is
estimated to be about
A.
B.
C.
D.
E.
$33,500.
$2,800 monthly.
$33.50 per square foot monthly.
$33.50 per square foot annually.
None of the above is
Simple Linear Model:
Simple Linear Model
The least squares estimates of
0, 1. We minimize the sum
of squares of residuals:
The Minimizers:
y = b0 + b1x is used to
estimate 0 + 1x.
Horse powe r Le v e ra g e Re si d u a l s
MPG City Leverage Plot
250
200
150
100
50
15
20
25
30
35
40
Hors e powe r Le v e ra g e Re s i d u a l s
MPG City Leverage, P=0.0001
MPG Hwy Leverage Plot
250
200
150
100
50
20
25
30
35
40
Hors e powe r Le v e ra