Fundamentals of Statistics, Books a la Carte Edition Plus MyLab Statistics with Pearson eText -- Access Card Package (5th Edition)
5th Edition
ISBN: 9780134763699
Author: Michael Sullivan III
Publisher: PEARSON
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Chapter 3.1, Problem 14AYU
Exam Time The following data represent the amount of time (in minutes) a random sample of eight students took to complete the online portion of an exam in Sullivan’s Statistics course. Compute the
60.5, 128.0, 84.6, 122.3, 78.9, 94.7, 85.9, 89.9
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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 3 Solutions
Fundamentals of Statistics, Books a la Carte Edition Plus MyLab Statistics with Pearson eText -- Access Card Package (5th Edition)
Ch. 3.1 - What does it mean if a statistic is resistant?Ch. 3.1 - In the 2014 Current Population Survey conducted by...Ch. 3.1 - The U.S. Department of Housing and Urban...Ch. 3.1 - A histogram of a set of data indicates that the...Ch. 3.1 - If a data set contains 10,000 values arranged in...Ch. 3.1 - True or False: A data set will always have exactly...Ch. 3.1 - In Problems 710, find the population mean or...Ch. 3.1 - In Problems 710, find the population mean or...Ch. 3.1 - In Problems 710, find the population mean or...Ch. 3.1 - In Problems 710, find the population mean or...
Ch. 3.1 - For Super Bowl XLVII, there were 82,566 tickets...Ch. 3.1 - The median for the given set of six ordered data...Ch. 3.1 - Miles per Gallon The following data represent the...Ch. 3.1 - Exam Time The following data represent the amount...Ch. 3.1 - NW Concrete Mix A certain type of concrete mix is...Ch. 3.1 - Flight Time The following data represent the...Ch. 3.1 - For each of the three histograms shown, determine...Ch. 3.1 - Match the histograms shown to the summary...Ch. 3.1 - Exam Scores The data in the next column represent...Ch. 3.1 - pH in Water The acidity or alkalinity of a...Ch. 3.1 - NW Pulse Rates The following data represent the...Ch. 3.1 - Travel Time The data represent the travel time (in...Ch. 3.1 - NW Connection Time A histogram of the connection...Ch. 3.1 - Journal Costs A histogram of the annual...Ch. 3.1 - MMs The following data represent the weights (in...Ch. 3.1 - Old Faithful We have all heard of the Old Faithful...Ch. 3.1 - Hours Working A random sample of 25 college...Ch. 3.1 - Prob. 28AYUCh. 3.1 - NW Political Views A sample of 30 registered...Ch. 3.1 - Prob. 30AYUCh. 3.1 - Prob. 31AYUCh. 3.1 - Mr. Zuro finds the mean height of all 14 students...Ch. 3.1 - Missing Exam Grade A professor has recorded exam...Ch. 3.1 - Prob. 34AYUCh. 3.1 - Blood Alcohol Concentration Go to...Ch. 3.1 - Prob. 36AYUCh. 3.1 - Linear Transformations Benjamin owns a small...Ch. 3.1 - Linear Transformations Use the five test scores of...Ch. 3.1 - Trimmed Mean Another measure of central tendency...Ch. 3.1 - Prob. 40AYUCh. 3.1 - Putting It Together: Shape, Mean and Median As...Ch. 3.1 - FICO Scores The Fair Isaacs Corporation has...Ch. 3.1 - Why is the median resistant, but the mean is not?Ch. 3.1 - Prob. 44AYUCh. 3.1 - Net Worth According to a Credit Suisse Survey, the...Ch. 3.1 - Prob. 46AYUCh. 3.1 - In January 2016, the mean amount of money lost per...Ch. 3.1 - For each of the following situations, determine...Ch. 3.2 - The sum of the deviations about the mean always...Ch. 3.2 - The standard deviation is used in conjunction with...Ch. 3.2 - True or False: When comparing two populations, the...Ch. 3.2 - True or False: Chebyshevs Inequality applies to...Ch. 3.2 - In Problems 510, by hand, find the population...Ch. 3.2 - In Problems 510, by hand, find the population...Ch. 3.2 - In Problems 510, by hand, find the population...Ch. 3.2 - In Problems 510, by hand, find the population...Ch. 3.2 - In Problems 510, by hand, find the population...Ch. 3.2 - In Problems 510, by hand, find the population...Ch. 3.2 - Miles per Gallon The following data represent the...Ch. 3.2 - Exam Time The following data represent the amount...Ch. 3.2 - NW Concrete Mix A certain type of concrete mix is...Ch. 3.2 - Flight Time The following data represent the...Ch. 3.2 - Which histogram depicts a higher standard...Ch. 3.2 - Match the histograms in the next column to the...Ch. 3.2 - Exam Scores The following data represent exam...Ch. 3.2 - pH in Water The acidity or alkalinity of a...Ch. 3.2 - NW Pulse Rates The data on the following page...Ch. 3.2 - Travel Time The following data represent the...Ch. 3.2 - A Fish Story Ethan and Drew went on a 10-day...Ch. 3.2 - Prob. 22AYUCh. 3.2 - The Empirical Rule The following data represent...Ch. 3.2 - The Empirical Rule The following data represent...Ch. 3.2 - Prob. 25AYUCh. 3.2 - Prob. 26AYUCh. 3.2 - Prob. 27AYUCh. 3.2 - Temperatures It is well known that San Diego has...Ch. 3.2 - NW The Empirical Rule The StanfordBinet...Ch. 3.2 - The Empirical Rule SAT Math scores have a...Ch. 3.2 - The Empirical Rule The weight, in grams, of the...Ch. 3.2 - The Empirical Rule The distribution of the length...Ch. 3.2 - Which Professor Suppose Professor Alpha and...Ch. 3.2 - Larry Summers Lawrence Summers (former Secretary...Ch. 3.2 - NW Chebyshevs Inequality In December 2014, the...Ch. 3.2 - Chebyshevs Inequality According to the U.S. Census...Ch. 3.2 - Prob. 37AYUCh. 3.2 - Linear Transformations Benjamin owns a small...Ch. 3.2 - Prob. 39AYUCh. 3.2 - Prob. 40AYUCh. 3.2 - Prob. 41AYUCh. 3.2 - Blocking and Variability Blocking refers to the...Ch. 3.2 - Prob. 43AYUCh. 3.2 - Prob. 44AYUCh. 3.2 - Prob. 45AYUCh. 3.2 - More Spread? The data set on the left represents...Ch. 3.2 - Prob. 47AYUCh. 3.2 - Prob. 48AYUCh. 3.2 - Prob. 49AYUCh. 3.2 - What is meant by the phrase degrees of freedom as...Ch. 3.2 - Prob. 51AYUCh. 3.2 - Prob. 52AYUCh. 3.2 - What makes the range less desirable than the...Ch. 3.2 - Prob. 54AYUCh. 3.2 - Prob. 55AYUCh. 3.2 - Prob. 56AYUCh. 3.2 - Prob. 57AYUCh. 3.2 - Prob. 59AYUCh. 3.3 - NW Savings Recently, a random sample of 2534 year...Ch. 3.3 - Square Footage of Housing The frequency...Ch. 3.3 - Household Winter Temperature Often, frequency...Ch. 3.3 - Living in Poverty (See Problem 3.) The following...Ch. 3.3 - Multiple Births The following data represent the...Ch. 3.3 - Birth Weight The following frequency distribution...Ch. 3.3 - Cigarette Tax Rates Use the frequency distribution...Ch. 3.3 - Dividend Yield Use the frequency distribution...Ch. 3.3 - NW Grade-Point Average Marissa has just completed...Ch. 3.3 - Computing Class Average In Marissas calculus...Ch. 3.3 - Mixed Chocolates Michael and Kevin want to buy...Ch. 3.3 - Nut Mix Michael and Kevin return to the candy...Ch. 3.3 - Population The data represent the male and female...Ch. 3.3 - Age of Mother The following data represent the age...Ch. 3.3 - Approximate the median of the frequency...Ch. 3.3 - Prob. 16AYUCh. 3.3 - Prob. 17AYUCh. 3.3 - Determine the modal class of the frequency...Ch. 3.4 - The _____ represents the number of standard...Ch. 3.4 - The _____ _____ of a data set is a value such that...Ch. 3.4 - _____ divide data sets into fourths.Ch. 3.4 - Prob. 4AYUCh. 3.4 - Prob. 5AYUCh. 3.4 - Prob. 6AYUCh. 3.4 - Men versus Women The average 20- to 29-year-old...Ch. 3.4 - Prob. 8AYUCh. 3.4 - ERA Champions In 2014, Clayton Kershaw of the Los...Ch. 3.4 - Batting Champions The highest batting average ever...Ch. 3.4 - Prob. 11AYUCh. 3.4 - Triathlon Roberto finishes a triathlon (750-meter...Ch. 3.4 - School Admissions A highly selective boarding...Ch. 3.4 - Quality Control A manufacturer of bolts has a...Ch. 3.4 - Prob. 15AYUCh. 3.4 - You Explain It! Percentiles Explain the meaning of...Ch. 3.4 - You Explain It! Quartiles Violent crimes include...Ch. 3.4 - You Explain It! Quartiles One variable that is...Ch. 3.4 - Ogives and Percentiles The following graph is an...Ch. 3.4 - Ogives and Percentiles The following graph is an...Ch. 3.4 - NW SMART Car The data on the following page...Ch. 3.4 - Hemoglobin in Cats The following data represent...Ch. 3.4 - Rate of Return of Google The following data...Ch. 3.4 - CO2 Emissions The following data represent the...Ch. 3.4 - Fraud Detection As part of its Customers First...Ch. 3.4 - Stolen Credit Card A credit card company has a...Ch. 3.4 - Student Survey of Income A survey of 50 randomly...Ch. 3.4 - Student Survey of Entertainment Spending A survey...Ch. 3.4 - Prob. 29AYUCh. 3.4 - Travel Time Use the results of Problem 22 in...Ch. 3.4 - Fraud Detection Revisited Use the fraud-detection...Ch. 3.4 - Write a paragraph that explains the meaning of...Ch. 3.4 - Suppose you received the highest score on an exam....Ch. 3.4 - Prob. 34AYUCh. 3.4 - Prob. 35AYUCh. 3.4 - Prob. 36AYUCh. 3.4 - Prob. 37AYUCh. 3.4 - Prob. 38AYUCh. 3.4 - Prob. 39AYUCh. 3.5 - What does the five-number summary consist of?Ch. 3.5 - In a boxplot, if the median is to the left of the...Ch. 3.5 - Prob. 3AYUCh. 3.5 - In Problems 3 and 4, (a) identify the shape of the...Ch. 3.5 - Use the side-by-side boxplots shown to answer the...Ch. 3.5 - Use the side-by-side boxplots shown to answer the...Ch. 3.5 - Exam Scores After giving a statistics exam,...Ch. 3.5 - Prob. 8AYUCh. 3.5 - Prob. 9AYUCh. 3.5 - Carpoolers The following data represent the...Ch. 3.5 - NW Age of Mother at Birth The data below represent...Ch. 3.5 - Prob. 12AYUCh. 3.5 - Prob. 13AYUCh. 3.5 - Prob. 14AYUCh. 3.5 - Prob. 15AYUCh. 3.5 - Prob. 16AYUCh. 3.5 - Putting It Together: Earthquakes Go to...Ch. 3.5 - Putting It Together: Paternal Smoking It is...Ch. 3.5 - Retain Your Knowledge: Decision Making and Hunger...Ch. 3.5 - Prob. 20AYUCh. 3.5 - Prob. 21AYUCh. 3 - Muzzle Velocity The following data represent the...Ch. 3 - Price of Chevy Cobalts The following data...Ch. 3 - Chief Justices The following data represent the...Ch. 3 - Number of Tickets Issued As part of a statistics...Ch. 3 - Chebyshevs Inequality and the Empirical Rule...Ch. 3 - Prob. 6RECh. 3 - Weighted Mean Michael has just completed his first...Ch. 3 - Weights of Males versus Females According to the...Ch. 3 - Halladay No-No On October 6, 2010, Roy Halladay of...Ch. 3 - Presidential Inaugural Addresses Ever wonder how...Ch. 3 - You Explain It! Percentiles According to the...Ch. 3 - Skinfold Thickness Procedure One method of...Ch. 3 - The following data represent the amount of time...Ch. 3 - The Federal Bureau of Investigation classifies...Ch. 3 - Determine the range of the homework data from...Ch. 3 - a. Determine the standard deviation of the...Ch. 3 - In a random sample of 250 toner cartridges, the...Ch. 3 - The following data represent the length of time...Ch. 3 - Prob. 7CTCh. 3 - An engineer is studying bearing failures for two...Ch. 3 - The following data represent the weights (in...Ch. 3 - Armando is filling out a college application that...Ch. 3 - According to the National Center for Health...Ch. 3 - Prob. 12CTCh. 3 - Answer the following based on the histograms shown...Ch. 3 - Explain how the standard deviation measures...Ch. 3 - Generate a data set consisting of the length of...Ch. 3 - Prob. 2CSCh. 3 - Prob. 3CS
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