spring2008stat201-hw03KEY

spring2008stat201-hw03KEY - 36-201 Spring 2008 Homework 3...

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This document available on: http://www.stat.cmu.edu/~gordonw/spring2008stat201.html 36-201 Spring 2008 Homework 3 – KEY
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Stat 201 Spring 2008 Page 1 of 11 Homework 3 – KEY This document available on: http://www.stat.cmu.edu/~gordonw/spring2008stat201.html Due: Wednesday, February 6 , at the beginning of lecture. Homework considered late beyond the first 10 minutes of lecture. Late Homework Policy: Late homework may be turned-in for a maximum of half credit, up to 4:00 PM on the same Wednesday the homework is due. Late homework should be placed in the manila envelope which will be posted by room 328-C, Facilities Management Building (FMS). Late homework should be labeled with the course as well as your name. Please do not turn in any homework to any mailboxes. Please include the top-page ‘coversheet’, filled-out and stapled to your homework. Show all work. This homework covers through chapter 4 in the course textbook. Point Distribution: Exercise 1 Exercise 2 Exercise 3 Exercise 4 Exercise 5 effort & neatness TOTAL 24 12 7 13 24 20 100 NOTE: To save paper, you are encouraged to print double-side (‘duplex’ mode).
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Stat 201 Spring 2008 Page 2 of 11 Homework 3 – KEY This document available on: http://www.stat.cmu.edu/~gordonw/spring2008stat201.html IMPORTANT NOTE: The first hourly exam will be held Monday, February 18, in lecture. The first exam will cover through this homework. 1. Advertisers are often accused of using sexual imagery, especially to appeal to male consumers. To determine if this is really true, one study* classified each of 1509 full-page magazine ads according to appearance of the ad (sexual or not), and then also based on the target readership of the magazine (male readers, female readers, or general readership). Male readership Female readership General readership Sexual 105 225 66 396 Not sexual 514 351 248 1113 619 576 314 1509 * “The prevalence of sexual imagery in ads targeted to young adults,” Journal of Consumer Affiars , 37 (2003), pp. 388 – 412, reprinted in Introduction to the Practice of Statistics, 5 th ed , by Moore and McCabe. First, let’s practice how to read contingency tables. For each of the following, use the table appropriately, and please round your answers to 2 decimal places (or equivalently, to the nearest percent). 1 (a) What proportion of ads in the study were sexual? [Show calculation.] Solution: = 1509 396 total grand sexual .26 (or, about 26%) 1 (b) What proportion of ads in the study were targeted to male readership? [Show calculation.] Solution: = 1509 619 total grand readership male .41 (or, about 41%) 1 (c) What proportion of ads in the study were sexual and targeted to Male readership? [Show calculation.] Solution: = 1509
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spring2008stat201-hw03KEY - 36-201 Spring 2008 Homework 3...

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