Essentials of Modern Business Statistics with Microsoft Office Excel (Book Only)
7th Edition
ISBN: 9781337681643
Author: David R. Anderson; Dennis J. Sweeney; Thomas A. Williams
Publisher: Cengage Learning US
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Chapter 4.3, Problem 22E
To determine
(a)
To find the
To determine
(b)
To find the
To determine
(c)
To find the
To determine
(d)
To find the
To determine
(e)
To find the probability for
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(c) Because logistic regression predicts probabilities of outcomes, observations used to build a logistic regression model need not be independent.
A. false: all observations must be independent
B. true
C. false: only observations with the same outcome need to be independent
I ANSWERED: A. false: all observations must be independent.
(This was marked wrong but I have no idea why. Isn't this a basic assumption of logistic regression)
Business discuss
Spam filters are built on principles similar to those used in logistic regression. We fit a probability that each message is spam or not spam. We have several variables for each email. Here are a few: to_multiple=1 if there are multiple recipients, winner=1 if the word 'winner' appears in the subject line, format=1 if the email is poorly formatted, re_subj=1 if "re" appears in the subject line. A logistic model was fit to a dataset with the following output:
Estimate
SE
Z
Pr(>|Z|)
(Intercept)
-0.8161
0.086
-9.4895
0
to_multiple
-2.5651
0.3052
-8.4047
0
winner
1.5801
0.3156
5.0067
0
format
-0.1528
0.1136
-1.3451
0.1786
re_subj
-2.8401
0.363
-7.824
0
(a) Write down the model using the coefficients from the model fit.log_odds(spam) = -0.8161 + -2.5651 + to_multiple + 1.5801 winner + -0.1528 format + -2.8401 re_subj(b) Suppose we have an observation where to_multiple=0, winner=1, format=0, and re_subj=0. What is the predicted probability that this message is spam?…
Chapter 4 Solutions
Essentials of Modern Business Statistics with Microsoft Office Excel (Book Only)
Ch. 4.1 - An experiment has three steps with three outcomes...Ch. 4.1 - How many ways can three items be selected from a...Ch. 4.1 - Prob. 3ECh. 4.1 - Consider the experiment of tossing a coin three...Ch. 4.1 - Suppose an experiment has five equally likely...Ch. 4.1 - An experiment with three outcomes has been...Ch. 4.1 - Prob. 7ECh. 4.1 - In the city of Milford, applications for zoning...Ch. 4.1 - Prob. 9ECh. 4.1 - The following table shows the percentage of...
Ch. 4.1 - A Gallup Poll of U.S. adults indicated that...Ch. 4.1 - The Powerball lottery is played twice each week in...Ch. 4.1 - A company that manufactures toothpaste is studying...Ch. 4.2 - Prob. 14ECh. 4.2 - Consider the experiment of selecting a playing...Ch. 4.2 - Consider the experiment of rolling a pair of dice....Ch. 4.2 - Refer to the KP&L sample points and sample point...Ch. 4.2 - Prob. 18ECh. 4.2 - Do you think global warming will have an impact on...Ch. 4.2 - Junior Achievement USA and the Allstate Foundation...Ch. 4.2 - Data on U S. work-related fatalities by cause...Ch. 4.3 - Prob. 22ECh. 4.3 - Suppose that we have a sample space...Ch. 4.3 - Clarkson University surveyed alumni to learn more...Ch. 4.3 - Prob. 25ECh. 4.3 - Information about mutual funds provided by...Ch. 4.3 - Prob. 27ECh. 4.3 - A survey of magazine subscribers showed that 45.8%...Ch. 4.3 - Prob. 29ECh. 4.4 - Suppose that we have two events, A and B, with...Ch. 4.4 - Prob. 31ECh. 4.4 - Consider the following example survey results of...Ch. 4.4 - Prob. 33ECh. 4.4 - The Bureau of Transportation Statistics reports...Ch. 4.4 - To better understand how husbands and wives feel...Ch. 4.4 - Prob. 36ECh. 4.4 - A joint survey by Parade magazine and Yahoo! found...Ch. 4.4 - The Institute for Higher Education Policy, a...Ch. 4.5 - The prior probabilities for events A1 and A2 are...Ch. 4.5 - Prob. 40ECh. 4.5 - A consulting firm submitted a bid for a large...Ch. 4.5 - A local bank reviewed its credit card policy with...Ch. 4.5 - In August 2012, tropical storm Isaac formed in the...Ch. 4.5 - ParFore created a website to market golf equipment...Ch. 4.5 - The percentage of adult users of the Internet who...Ch. 4 - A USA Today survey of adults aged 18 and older...Ch. 4 - A financial manager made two new investments—one...Ch. 4 - Below are the results of a survey of 1364...Ch. 4 - A study of 31,000 hospital admissions in New York...Ch. 4 - Prob. 50SECh. 4 - Prob. 51SECh. 4 - Prob. 52SECh. 4 - Refer again to the data from the MBA new...Ch. 4 - The Pew Internet & American Life project conducted...Ch. 4 - A large consumer goods company ran a television...Ch. 4 - Cooper Realty is a small real estate company...Ch. 4 - A company studied the number of lost-time...Ch. 4 - According to the Open Doors Report, 9.5% of all...Ch. 4 - An oil company purchased an option on land in...Ch. 4 - A study reported by Forbes indicated that the five...Ch. 4 - Hamilton County Judges Hamilton County judges try...Ch. 4 - Hamilton County Judges Hamilton County judges try...Ch. 4 - Hamilton County Judges Hamilton County judges try...Ch. 4 - Hamilton County Judges Hamilton County judges try...Ch. 4 - Hamilton County Judges Hamilton County judges try...Ch. 4 - Rob's Market Rob's Market (RM) is a regional food...Ch. 4 - Prob. 4.2.2CPCh. 4 - Rob's Market Rob's Market (RM) is a regional food...Ch. 4 - Rob's Market Rob's Market (RM) is a regional food...Ch. 4 - Prob. 4.2.5CPCh. 4 - Rob's Market Rob's Market (RM) is a regional food...Ch. 4 - Prob. 4.2.7CPCh. 4 - Prob. 4.2.8CPCh. 4 - Prob. 4.2.9CPCh. 4 - Rob's Market Rob's Market (RM) is a regional food...
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