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14. A hair salon did a survey of 354 customers regarding satisfaction with service and type of customer. A walk-In customer B one seen no ads and not been referred. The other customers elther saw a TV ad or were referred to the salon (but not both). The re follow. Assume the sample represents the entire population of customers. Find the probability that a customer is a Not satisfied b. Not satisfied and a walk-in c Very satisfied, given referred d. Neutral or referred e. Saw add and was referred Walk-In TV Ad Referred Total 1 Not Satied 22 Ntral 43 Sutied Very Satued 252 354

14. A hair salon did a survey of 354 customers regarding satisfaction with service and type of customer. A walk-In customer B one seen no ads and not been referred. The other customers elther saw a TV ad or were referred to the salon (but not both). The re follow. Assume the sample represents the entire population of customers. Find the probability that a customer is a Not satisfied b. Not satisfied and a walk-in c Very satisfied, given referred d. Neutral or referred e. Saw add and was referred Walk-In TV Ad Referred Total 1 Not Satied 22 Ntral 43 Sutied Very Satued 252 354

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Design Layout References Mailings Review View ambria A- A- A A =,三 26 AaBbCcDdEe AaBbCcD AABBCCDDE AaBb AaBbCcDdEe AaBbCcDdEe AaBbCcD abe X, x? A - A E = = E Emphasis I Normal Heading 1 Heading 2 Title Subtitle Strang 14. A hair salon did a survey of 354 customers regarding satisfaction with service and type of customer. A walk-In customer is one who has seen no ads and not been referred. The other customers elther saw a TV ad or were referred to the salon (but not both). The results follow. Assume the sample represents the entire population of customers. Find the probability that a customer is a Not satisfied b. Not satisfied and a walk-in c Very satisfied, given referred d. Neutral or referred e. Saw add and was referred Walk-In TV Ad Referred Total 35 Not Satiled 19 11 22 40 80 Neutral 18 41 99 132 Satisied 32 31 48 107 28 Very Satiiad 152 354 97 Total 15. According to the American Management Association, most U.S. companies now test at least some employees and job applicants for drug use. The U.S. National Institute on Drug Abuse claims that about 15% of people in the 18-25 age bracket use illegal drugs. Allyn Clark, a 21 year-old college graduate, applied for a job at the Acton Paper Company, took a drug test, and was not offered a job. He suspected that he might have failed the drug test, even though he does not use drugs. In checking with the company's personnel department, he found that the drug test has 99% sensitivity, which means that only 1% of drug users incorrectly test negative. Also, the test has 98% specificity, meaning that only 2% of nonusers are incorrectly identified as drug users. Allyn felt relieved by these figures because he believed that they reflected a very reliable test that usually provides good results. But is this really true? The accompanying table shows data for Allyn and 1,999 other job applicants. Based on those results: a. Find Plfalse positive); that is, find the probability of randomly selecting one of the subjects who tested positive and getting someone who does not use drugs. Focus 14 871 words English (United States)
Transcribed Image Text:Design Layout References Mailings Review View ambria A- A- A A =,三 26 AaBbCcDdEe AaBbCcD AABBCCDDE AaBb AaBbCcDdEe AaBbCcDdEe AaBbCcD abe X, x? A - A E = = E Emphasis I Normal Heading 1 Heading 2 Title Subtitle Strang 14. A hair salon did a survey of 354 customers regarding satisfaction with service and type of customer. A walk-In customer is one who has seen no ads and not been referred. The other customers elther saw a TV ad or were referred to the salon (but not both). The results follow. Assume the sample represents the entire population of customers. Find the probability that a customer is a Not satisfied b. Not satisfied and a walk-in c Very satisfied, given referred d. Neutral or referred e. Saw add and was referred Walk-In TV Ad Referred Total 35 Not Satiled 19 11 22 40 80 Neutral 18 41 99 132 Satisied 32 31 48 107 28 Very Satiiad 152 354 97 Total 15. According to the American Management Association, most U.S. companies now test at least some employees and job applicants for drug use. The U.S. National Institute on Drug Abuse claims that about 15% of people in the 18-25 age bracket use illegal drugs. Allyn Clark, a 21 year-old college graduate, applied for a job at the Acton Paper Company, took a drug test, and was not offered a job. He suspected that he might have failed the drug test, even though he does not use drugs. In checking with the company's personnel department, he found that the drug test has 99% sensitivity, which means that only 1% of drug users incorrectly test negative. Also, the test has 98% specificity, meaning that only 2% of nonusers are incorrectly identified as drug users. Allyn felt relieved by these figures because he believed that they reflected a very reliable test that usually provides good results. But is this really true? The accompanying table shows data for Allyn and 1,999 other job applicants. Based on those results: a. Find Plfalse positive); that is, find the probability of randomly selecting one of the subjects who tested positive and getting someone who does not use drugs. Focus 14 871 words English (United States)
me Insert Design Layout References Mailings Review View 三,三 , AaBbCcD AaBbCcDdE AaBb Aa BbCcDdEe Cambria 26 A- A- A AaßbCcDdEe AaBbCcDdEe AaBbCcDdEe AasbCe Normal Heading 1 Heading 2 Subtitle Emphasis Strong Colorful Title te abe X2 x A 15. According to the American Managernent Assocdation, most U.S. companies now test at least sorme employees and job applicants for drug use. The U.S. National Institute on Drug Abuse dalms that about 15% of people in the 18-25 age bracket use illegal drugs. Allyn Clark, a 21 year-old college graduate, appled for a job at the Acton Paper Company, took a drug test, and was not offered a job. He suspected that he might have failed the drug test, even though he does not use drugs. In checking with the company's personnel department, he found that the drug test has 99% sensitivity, which means that only 1% of drug users incorrectly test negative. Also, the test has 98% specificity, meaning that only 2% of nonusers are Incorrectly identified as drug users. Allyn felt releved by these figures because he beleved that they reflected a very rellable test that usually provides good results. But is this really true? The accompanying table shows data for Allyn and 1,999 other Job applicants. Based on those results: a Find Pfalse positive); that is, find the probability of randomly selecting one of the subjects who tested positive and getting someone who does not use drugs. b. Find Pifalse negative); that is, find the probability of randomly selecting someone who tested negative and getting someone who does use drugs. c Are the probabilities of these wrong results low enough so that job applicants and the Acton Paper Company need not be concerned? Explain your answers. Drug User Non-User Total 34 Positive Test Result 297 Negative Test Result 3 Total 1666 Focus Page 3 of 4 871 words English (United States) MacBook Air
Transcribed Image Text:me Insert Design Layout References Mailings Review View 三,三 , AaBbCcD AaBbCcDdE AaBb Aa BbCcDdEe Cambria 26 A- A- A AaßbCcDdEe AaBbCcDdEe AaBbCcDdEe AasbCe Normal Heading 1 Heading 2 Subtitle Emphasis Strong Colorful Title te abe X2 x A 15. According to the American Managernent Assocdation, most U.S. companies now test at least sorme employees and job applicants for drug use. The U.S. National Institute on Drug Abuse dalms that about 15% of people in the 18-25 age bracket use illegal drugs. Allyn Clark, a 21 year-old college graduate, appled for a job at the Acton Paper Company, took a drug test, and was not offered a job. He suspected that he might have failed the drug test, even though he does not use drugs. In checking with the company's personnel department, he found that the drug test has 99% sensitivity, which means that only 1% of drug users incorrectly test negative. Also, the test has 98% specificity, meaning that only 2% of nonusers are Incorrectly identified as drug users. Allyn felt releved by these figures because he beleved that they reflected a very rellable test that usually provides good results. But is this really true? The accompanying table shows data for Allyn and 1,999 other Job applicants. Based on those results: a Find Pfalse positive); that is, find the probability of randomly selecting one of the subjects who tested positive and getting someone who does not use drugs. b. Find Pifalse negative); that is, find the probability of randomly selecting someone who tested negative and getting someone who does use drugs. c Are the probabilities of these wrong results low enough so that job applicants and the Acton Paper Company need not be concerned? Explain your answers. Drug User Non-User Total 34 Positive Test Result 297 Negative Test Result 3 Total 1666 Focus Page 3 of 4 871 words English (United States) MacBook Air
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14) Solution:

The result of the survey is 

  Walk in TV Ad Refered  Total 
Not satisfied  19 11 5 35
Neutral  18 22 40 80
Satisfied 32 41 59 132
Very Satisfied  28 31 48 107
Total  97 105 152 354
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