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https/www.mathlynx.com/online/collab,stat prob, eval cum?mode-evaicourse... a t(15%) (what is the probabity of a chid not having brown hair? P(Bre)-0.592 Problem 5 Three professors at George Washington Unversity did an experiment to determine If economists are more selfish than other people. They dropped 190 stamped, addressed envelopes with $20 these, 42% wee returned overol. From te economics dass 47% cash in two different classrooms (one economics, one not) on the George Washington campus. or ofthe envelopes were returned. From the other class 36% were Let: R- money returned, E economics dass;other class (25%) which of the follo ing probabity statements represents the overal percent or money et med, lackin b. 25% Which of the to owing probabity statements enesets the peered o er etnea me ne sono n sas, a c (25M6) Which of the following probabilty statements represents the percent of money returned from the other class? (pck on d.(25%) lsmoney being returned ndependent ofthe dass? eck one, why? Cuno AL Topics ,Probably Eval aton #5 Discrene Random Vaniables Topkes in Psbably Evaluation Copyright & Mathlynx 2012 All rights reserved ssor Rojas from esc FI 0 F2 F3 F4 FS - Fb 2 3

Explanation / Answer

(a)
Th overall percent of money returned = 42%
(b)
The percent of money retuned from the economics class = 47%
(c)
The percent of money retuned from the other class = 36%
(d)
Is money retuened Independent of the class? No. Because there is significant difference between money returned from economics class and other class (47%-36%=11%)

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