wileyplus.comedugen/student/mainfr.uni C Q Search WileyPLUS: MyWileyPLUS Help Co

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wileyplus.comedugen/student/mainfr.uni C Q Search WileyPLUS: MyWileyPLUS Help Contact Us Logo G Mann, Introductory statistics, 9e INTRO STATS. (MQM 1ot BACK NEXT STANDARD VIEW PRINTER VERSION Chapter 4, Section 4.3, Problem 34a 2095 randomly selected adults were asked whether or not they have ever shopped on the Internet. The following table gives a two-way classification of the responses. Have Shopped Have Never Shopped Male 500 700 Female 300 595 Round your answers to three decimal places. If one adult is selected at random from these 2095 adults, find the probability that this adult I has never shopped on the Internet. ii. is a male it has shopped on the Internet given that this adult is a female. i, is a male given that this adult has never shopped on the Internet. 3 0 0 . 0 ID 5 wi O) A A BE 25

Explanation / Answer

a) P(never shopped)= (700+595)/(500+700+300+595)=0.618

b) P(male) = (500+700)/(500+700+300+595) =0.5728

c) P(shopped | female)=P(shopped and female)/P(female)= 300/(300+595)=0.3352

d) P(male | never shopped)=P(male and never shopped)/P(never shopped)=700/(700+595)=0.5405

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