EP STAT.F/PSYCHOLOGY-MYLAB W/ETEXT
6th Edition
ISBN: 9780205847112
Author: Aron
Publisher: PEARSON CO
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Chapter 1, Problem 2PP
a.
To determine
Identify the level of measurement for the ethnic group to which a person belongs.
b.
To determine
Identify the level of measurement for the number of times a mouse makes a wrong turn in a laboratory maze.
c.
To determine
Identify the level of measurement for the position a runner finishes in a race.
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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 1 Solutions
EP STAT.F/PSYCHOLOGY-MYLAB W/ETEXT
Ch. 1 - A father rates his daughter as a 2 on a 7-point...Ch. 1 - What is the difference between a numeric and a...Ch. 1 - Give the level of measurement of each of the...Ch. 1 - What is the difference between a discrete and a...Ch. 1 - What is a frequency table?
Ch. 1 - Why would a researcher want to make a frequency...Ch. 1 - Make a frequency table for the following scores:...Ch. 1 -
What does a grouped frequency table group?
Ch. 1 -
Why do researchers make histograms?
Ch. 1 - When making a histogram from a frequency table,...
Ch. 1 - Make a histogram based on the following frequency...Ch. 1 - How is a histogram based on a nominal variable...Ch. 1 - Describe the difference between a unimodal and...Ch. 1 - What does it mean to say that a distribution is...Ch. 1 - What kind of skew is created by (a) a floor effect...Ch. 1 - When a distribution is described as being peaked...Ch. 1 - A client rates her satisfaction with her...Ch. 1 - Give the level of measurement for each of the...Ch. 1 - A particular block in a suburban neighborhood has...Ch. 1 - Fifty students were asked how many hours they...Ch. 1 - These are the scores on a test of sensitivity to...Ch. 1 - The following data are the number of minutes it...Ch. 1 - Describe the shapes of the three distributions...Ch. 1 - Make up and draw an example of each of the...Ch. 1 - Explain to a person who has never had a course in...Ch. 1 - McKee and Ptacek (2001) asked 90 college students...Ch. 1 - A participant in a cognitive psychology study is...Ch. 1 - Explain and give an example for each of the...Ch. 1 - An organizational psychologist asks 20 employees...Ch. 1 - A social psychologist asked 15 college students...Ch. 1 - Following are the speeds of 40 cars clocked by...Ch. 1 - Here are the number of holiday gifts purchased by...Ch. 1 - Explain to a person who has never taken a course...Ch. 1 - Make up and draw an example of each of the...Ch. 1 - Raskauskas and Stoltz (2007) asked a group of 84...Ch. 1 - Mouradian (2001) surveyed college students...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, statistics and related others by exploring similar questions and additional content below.Similar questions
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