MINDTAP PSYCHOLOGY FOR GRAVETTER/FORZAN
5th Edition
ISBN: 9781305264953
Author: Forzano
Publisher: IACCENGAGE
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Chapter 2, Problem 1EA
To determine
To describe:
The results of the study from an article and find reasons if any to doubt the results.
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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 2 Solutions
MINDTAP PSYCHOLOGY FOR GRAVETTER/FORZAN
Ch. 2.2 - Identify possible sources and use them to identify...Ch. 2.2 - Define applied research and basic research and...Ch. 2.3 - Define primary and secondary sources, identity...Ch. 2.3 - Describe the process of conducting a literature...Ch. 2.3 - Describe the differences between a full-text...Ch. 2.4 - Identify the basic sections of an APA-style...Ch. 2.4 - Prob. 7LOCh. 2.5 - Describe the characteristics of a good hypothesis...Ch. 2 - Prob. 1ECh. 2 - Make a list of five ideas for a general research...
Ch. 2 - Define primary and secondary sources and explain...Ch. 2 - Using PsycINFO (or a similar database), find five...Ch. 2 - Using PsycINFO (or a similar database), find...Ch. 2 - How does a full-text database differ from other...Ch. 2 - List the five sections typically found in a...Ch. 2 - Describe the three ways identified in the text to...Ch. 2 - Prob. 1EACh. 2 - Prob. 2EA
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