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week 5 individual Etext - E-Text Exercises 1 Chapter 15...

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E-Text Exercises 1 Chapter 15 E-Text Exercises Fadi Fayad RES/342 03/10/2011 G. Morris Hamm
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E-Text Exercises 2 E-Text Exercises 15.18 Sixty-four students in an introductory college economics class we re asked how many credits they had earned in college, and how certain they were about their choic e of major. Research question: At a = .01, is the degree of certainty independent of credits earned? Credits Earned Very Uncertain Somewhat Certain Very Certain Row Total 0–9 12 8 3 23 10–59 8 4 10 22 60 or more 1 7 11 19 Col Total 21 19 24 64 15.22 A student team examined parked cars in four different suburban shoppi ng malls. One hundred vehicles were examined in each location. Research question: At a = .05, does vehicle type vary by mall location? (Data are from a project by MBA students Alicia Morais, Steve Olson, and Greg Corda.) Vehicle Type Somerset Oakland Great Lakes Jamestown Row Total Car 44 49 36 64 193 Minivan 21 15 18 13 67 Full-sized Van 2 3 3 2 10 SUV 19 27 26 12 84 Truck 14 6 17 9 46 Col Total 100 100 100 100 400 15.24
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