6th Edition

ISBN: 9780134114262

Author: LARSEN

Publisher: PEARSON

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Textbook Question

Chapter 2.4, Problem 8Q

Given that P ( A ) = a and P ( B ) = b , show that

P ( A | B ) ≥ a + b − 1 b

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Chapter 2.4, Problem 7Q

Chapter 2.4, Problem 9Q

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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?…

Consider an event X comprised of three outcomes whose probabilities are 9/18, 1/18,and 6/18. Compute the probability of the complement of the event. Question content area bottom Part 1 A.1/2 B.2/18 C.16/18 D.16/3

Chapter 2 Solutions

INTRO.TO MATHEMATICAL STAT...-STD.SOLN.

Ch. 2.2 - A graduating engineer has signed up for three job...Ch. 2.2 - Three dice are tossed, one red, one blue, and one...Ch. 2.2 - An urn contains six chips numbered 1 through 6....Ch. 2.2 - Suppose that two cards are dealt from a standard...Ch. 2.2 - In the lingo of craps-shooters (where two dice are...Ch. 2.2 - A poker deck consists of fifty-two cards,...Ch. 2.2 - Let P be the set of right triangles with a 5...Ch. 2.2 - Suppose a baseball player steps to the plate with...Ch. 2.2 - A telemarketer is planning to set up a phone bank...Ch. 2.2 - Two darts are thrown at the following target: (a)...

Ch. 2.2 - A woman has her purse snatched by two teenagers....Ch. 2.2 - Consider the experiment of choosing coefficients...Ch. 2.2 - In the game of craps, the person rolling the dice...Ch. 2.2 - A probability-minded despot offers a convicted...Ch. 2.2 - Suppose that ten chips, numbered 1 through 10, are...Ch. 2.2 - Sketch the regions in the xy-plane corresponding...Ch. 2.2 - Referring to Example 2.2.7, find (AB) and (AB) if...Ch. 2.2 - Find (ABC) if A={x:0x4}, B={x:2x6} and...Ch. 2.2 - Prob. 19Q Ch. 2.2 - Prob. 20Q Ch. 2.2 - Let A be the set of five-card hands dealt from a...Ch. 2.2 - Suppose that each of the twelve letters in the...Ch. 2.2 - Let A, B, and C be any three events defined on a...Ch. 2.2 - Let A1,A2,........,Ak be any set of events defined...Ch. 2.2 - Let A, B, and C be any three events defined on a...Ch. 2.2 - Suppose that three eventsA, B, and Care de-fined...Ch. 2.2 - Prob. 27Q Ch. 2.2 - Let events A and B and sample space S be defined...Ch. 2.2 - A coin is tossed four times and the resulting...Ch. 2.2 - Pictured below are two organizational charts...Ch. 2.2 - During orientation week, the latest Spiderman...Ch. 2.2 - Let A and B be any two events. Use Venn diagrams...Ch. 2.2 - Let A, B, and C be any three events. Use Venn...Ch. 2.2 - Let A, B, and C be any three events. Use Venn...Ch. 2.2 - Let A and B be any two events defined on a sample...Ch. 2.2 - Use Venn diagrams to suggest an equivalent way of...Ch. 2.2 - A total of twelve hundred graduates of State Tech...Ch. 2.2 - Let A, B, and C be any three events defined on a...Ch. 2.2 - A poll conducted by a potential presidential...Ch. 2.2 - For two events A and B defined on a sample space...Ch. 2.3 - According to a family-oriented lobbying group,...Ch. 2.3 - Let A and B be any two events defined on S....Ch. 2.3 - Express the following probabilities in terms of...Ch. 2.3 - LetAandBbe two events defined on S. If the...Ch. 2.3 - Suppose that three fair dice are tossed. Let Ai be...Ch. 2.3 - Events A and B are defined on a sample space S...Ch. 2.3 - Let A1,A2....,An be a series of events for which...Ch. 2.3 - Draw the Venn diagrams that would correspond to...Ch. 2.3 - In the game of odd man out each player tosses a...Ch. 2.3 - An urn contains twenty-four chips, numbered 1...Ch. 2.3 - If States football team has a 10% chance of...Ch. 2.3 - Let events A1 and A2 are such that A1A2=S and...Ch. 2.3 - Prob. 13Q Ch. 2.3 - Prob. 14Q Ch. 2.3 - A coin is to be tossed four times. Define events X...Ch. 2.3 - Two dice are tossed. Assume that each possible...Ch. 2.3 - Let A, B, and C be three events defined on a...Ch. 2.3 - Lucy is currently running two dot-com scams out of...Ch. 2.4 - Suppose that two fair dice are tossed. What is the...Ch. 2.4 - Find P(AB) if P(A)=0.2,P(B)=0.4, and...Ch. 2.4 - If P(AB)P(A), show that P(BA)P(B).Ch. 2.4 - Let A and B be two events such that...Ch. 2.4 - Suppose that in Example 2.4.2 we ignored the ages...Ch. 2.4 - Two events, A and B, are defined on a sample space...Ch. 2.4 - An urn contains one red chip and one white chip....Ch. 2.4 - Given that P(A)=a and P(B)=b, show that P(AB)a+b1b Ch. 2.4 - An urn contains one white chip and a second chip...Ch. 2.4 - Suppose events A and B are such that P(AB)=0.1 and...Ch. 2.4 - One hundred voters were asked their opinions of...Ch. 2.4 - A fair coin is tossed three times. What is the...Ch. 2.4 - Two fair dice are rolled. What is the probability...Ch. 2.4 - Four cards are dealt from a standard 52-card poker...Ch. 2.4 - Prob. 15Q Ch. 2.4 - Given that P(A)+P(B)=0.9,P(AB)=0.5, and...Ch. 2.4 - Let A and B be two events defined on a sample...Ch. 2.4 - Suppose two dice are rolled. Assume that each...Ch. 2.4 - According to your neighborhood bookie, five horses...Ch. 2.4 - Andy, Bob, and Charley have all been serving time...Ch. 2.4 - An urn contains six white chips, four black chips,...Ch. 2.4 - A man has n keys on a key ring, one of which opens...Ch. 2.4 - Your favorite college football team has had a good...Ch. 2.4 - One chip is drawn at random from an urn that...Ch. 2.4 - A toy manufacturer buys ball bearings from three...Ch. 2.4 - A fair coin is tossed. If a head turns up, a fair...Ch. 2.4 - Foreign policy experts estimate that the...Ch. 2.4 - A telephone solicitor is responsible for...Ch. 2.4 - If men constitute 47% of the population and tell...Ch. 2.4 - Urn I contains three red chips and one white chip....Ch. 2.4 - Medical records show that 0.01% of the general...Ch. 2.4 - Prob. 32Q Ch. 2.4 - In an upstate congressional race, the incumbent...Ch. 2.4 - An urn contains forty red chips and sixty white...Ch. 2.4 - A study has shown that seven out of ten people...Ch. 2.4 - Based on pretrial speculation, the probability...Ch. 2.4 - Prob. 37Q Ch. 2.4 - The governor of a certain state has decided to...Ch. 2.4 - Following are the percentages of students of State...Ch. 2.4 - Urn I contains two white chips and one red chip;...Ch. 2.4 - Urn I contains three red chips and five white...Ch. 2.4 - A dashboard warning light is supposed to flash red...Ch. 2.4 - Building permits were issued last year to three...Ch. 2.4 - Two sections of a senior probability course are...Ch. 2.4 - A liquor store owner is willing to cash personal...Ch. 2.4 - Brett and Margo have each thought about murdering...Ch. 2.4 - Josh takes a twenty-question multiple-choice exam...Ch. 2.4 - Prob. 48Q Ch. 2.4 - At State University, 30% of the students are...Ch. 2.4 - Prob. 50Q Ch. 2.4 - When Zach wants to contact his girlfriend and he...Ch. 2.4 - A dot-com company ships products from three...Ch. 2.4 - A desk has three drawers. The first contains two...Ch. 2.4 - An automobile insurance company has compiled the...Ch. 2.5 - Suppose that P(AB)=0.2, P(A)=0.6, and P(B)=0.5....Ch. 2.5 - Spike is not a terribly bright student. His...Ch. 2.5 - Two fair dice are rolled. What is the probability...Ch. 2.5 - Emma and Josh have just gotten engaged. What is...Ch. 2.5 - Dana and Cathy are playing tennis. The probability...Ch. 2.5 - Three points, X1,X2andX3, are chosen at random in...Ch. 2.5 - Suppose that P(A)=14andP(B)=18 (a) What does P(AB)...Ch. 2.5 - Suppose that events A, B, and C are independent....Ch. 2.5 - A fair coin is tossed four times. What is the...Ch. 2.5 - Suppose that two cards are drawn simultaneously...Ch. 2.5 - Suppose that two fair dice (one red and one green)...Ch. 2.5 - A roulette wheel has thirty-six numbers colored...Ch. 2.5 - How many probability equations need to be...Ch. 2.5 - Prob. 14Q Ch. 2.5 - In a roll of a pair of fair dice (one red and one...Ch. 2.5 - On her way to work, a commuter encounters four...Ch. 2.5 - School board officials are debating whether to...Ch. 2.5 - Consider the following four-switch circuit: If all...Ch. 2.5 - A fast-food chain is running a new promotion. For...Ch. 2.5 - Players A, B, and C toss a fair coin in order. The...Ch. 2.5 - Prob. 21Q Ch. 2.5 - According to an advertising study, 15% of...Ch. 2.5 - A fair die is rolled and then n fair coins are...Ch. 2.5 - Prob. 24Q Ch. 2.5 - If two fair dice are tossed, what is the smallest...Ch. 2.5 - Prob. 26Q Ch. 2.5 - An urn contains w white chips, b black chips, and...Ch. 2.5 - Prob. 28Q Ch. 2.5 - A computer is instructed to generate a random...Ch. 2.5 - Prob. 30Q Ch. 2.5 - Stanleys statistics seminar is graded on a...Ch. 2.5 - What is the smallest number of switches wired in...Ch. 2.6 - Achemical engineer wishes to observe the effects...Ch. 2.6 - A coded message from a CIA operative to his...Ch. 2.6 - How many terms will be included in the expansion...Ch. 2.6 - Suppose that the format for license plates in a...Ch. 2.6 - How many integers between 100 and 999 have...Ch. 2.6 - A fast-food restaurant offers customers a choice...Ch. 2.6 - In baseball there are twenty-four different...Ch. 2.6 - Recall the postal zip codes described in Example...Ch. 2.6 - Arestaurant offers a choice of four appetizers,...Ch. 2.6 - An octave contains twelve distinct notes (on a...Ch. 2.6 - Residents of a condominium have an automatic...Ch. 2.6 - In international Morse code, each letter in the...Ch. 2.6 - The decimal number corresponding to a sequence of...Ch. 2.6 - Given the letters in the word ZOMBIESin how many...Ch. 2.6 - Suppose that two cards are drawnin orderfrom a...Ch. 2.6 - Monicas vacation plans require that she fly from...Ch. 2.6 - The board of a large corporation has six members...Ch. 2.6 - How many ways can a set of four tires be put on a...Ch. 2.6 - Use Stirlings formula to approximate 30!.(Note:...Ch. 2.6 - The nine members of the music faculty baseball...Ch. 2.6 - A three-digit number is to be formed from the...Ch. 2.6 - Four men and four women are to be seated in a row...Ch. 2.6 - An engineer needs to take three technical...Ch. 2.6 - How many ways can a twelve-member cheerleading...Ch. 2.6 - Suppose that a seemingly interminable German opera...Ch. 2.6 - A new horror movie, Friday the 13th, Part X, will...Ch. 2.6 - Suppose that ten people, including you and a...Ch. 2.6 - Use an induction argument to prove Theo-rem 2.6.1....Ch. 2.6 - In how many ways can a pack of fifty-two cards be...Ch. 2.6 - If the definition of n! is to hold for all...Ch. 2.6 - The crew of Apollo 17 consisted of a pilot, a...Ch. 2.6 - Uncle Harry and Aunt Minnie will both be attending...Ch. 2.6 - In how many ways can the digits 1 through 9 be...Ch. 2.6 - Which state name can generate more permutations,...Ch. 2.6 - How many numbers greater than four million can...Ch. 2.6 - An interior decorator is trying to arrange a shelf...Ch. 2.6 - Four Nigerians (A, B, C, D), three Chinese (#, ,...Ch. 2.6 - How many ways can the letters in the word...Ch. 2.6 - A tennis tournament has a field of 2n entrants,...Ch. 2.6 - Prob. 40Q Ch. 2.6 - In how many ways can the letters of the word...Ch. 2.6 - In how many ways can the word ABRACADABRA be...Ch. 2.6 - Prob. 43Q Ch. 2.6 - Prob. 44Q Ch. 2.6 - Prob. 45Q Ch. 2.6 - Prob. 46Q Ch. 2.6 - In how many ways can the letters of the word...Ch. 2.6 - Prob. 48Q Ch. 2.6 - Prob. 49Q Ch. 2.6 - How many straight lines can be drawn between five...Ch. 2.6 - The Alpha Beta Zeta sorority is trying to fill a...Ch. 2.6 - A boat has a crew of eight: Two of those eight can...Ch. 2.6 - Nine students, five men and four women, interview...Ch. 2.6 - The final exam in History 101 consists of five...Ch. 2.6 - Ten basketball players meet in the school gym for...Ch. 2.6 - Your statistics teacher announces a twenty-page...Ch. 2.6 - In how many ways can the letters in MI S S I S S I...Ch. 2.6 - Prove that (kn+1)=(kn)+(k1n) directly without...Ch. 2.6 - Find a recursion formula for (k+1n) in terms of...Ch. 2.6 - Show that n(n1)2n2=k=2nk(k1)Cnk.Ch. 2.6 - Prob. 61Q Ch. 2.6 - Prob. 62Q Ch. 2.6 - Compare the coefficients of tk in...Ch. 2.7 - Ten equally qualified marketing assistants are...Ch. 2.7 - An urn contains six chips, numbered 1 through 6....Ch. 2.7 - Anurn contains twenty chips, numbered1 through 20....Ch. 2.7 - A bridge hand (thirteen cards) is dealt from a...Ch. 2.7 - Consider a set of ten urns, nine of which contain...Ch. 2.7 - A committee of fifty politicians is to be chosen...Ch. 2.7 - Suppose that n fair dice are rolled. What are the...Ch. 2.7 - Five fair dice are rolled. What is the probability...Ch. 2.7 - Imagine that the test tube pictured contains 2n...Ch. 2.7 - Does a monkey have a better chance of rearranging...Ch. 2.7 - An apartment building has eight floors. If seven...Ch. 2.7 - If the letters in the phrase A ROLLING STONE...Ch. 2.7 - Suppose each of ten sticks is broken into a long...Ch. 2.7 - Six dice are rolled one time. What is the...Ch. 2.7 - Suppose that a randomly selected group of k people...Ch. 2.7 - Prob. 16Q Ch. 2.7 - Dana is not the worlds best poker player. Dealt a...Ch. 2.7 - A poker player is dealt a 7 of diamonds, a queen...Ch. 2.7 - Tim is dealt a 4 of clubs, a 6 of hearts, an 8 of...Ch. 2.7 - Five cards are dealt from a standard 52-card deck....Ch. 2.7 - Nine cards are dealt from a 52-card deck. Write a...Ch. 2.7 - A coke hand in bridge is one where none of the...Ch. 2.7 - A pinochle deck has forty-eight cards, two of each...

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Given that P ( A ) = a and P ( B ) = b , show that P ( A | B ) ≥ a + b − 1 b

Solution Summary: The author explains the verification of P(A|B)=a+b-1b.

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Chapter 2 Solutions