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Week 4 E-text assignment

Week 4 E-text assignment - 15.22 A student team examined...

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15.22 A student team examined parked cars in four different suburban shopping malls. One hundred vehicles were examined in each location. Research question: At α = . 05, does vehicle type vary by mall location? (Data are from a project by MBA students Steve Bennett, 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 : 0 H Vehicle types are independent of mall location A H : Vehicle types are dependent of mall location (I hope I did the chi-square right!) Chi-square Contingency Table Test for Independence Col 1 Col 2 Col 3 Col 4 Total Row 1 Observed 44 49 36 64 193 Expected 48.25 48.25 48.25 48.25 193.00 (O - E)² / E 0.37 0.01 3.11 5.14 8.64 Row 2 Observed 21 15 18 13 67 Expected 16.75 16.75 16.75 16.75 67.00 (O - E)² / E 1.08 0.18 0.09 0.84 2.19 Row 3 Observed 2 3 3 2 10 Expected 2.50 2.50 2.50 2.50 10.00 (O - E)² / E 0.10 0.10 0.10 0.10 0.40 Row 4 Observed 19 27 26 12 84 Expected 21.00 21.00 21.00 21.00 84.00 (O - E)² / E 0.19 1.71 1.19 3.86 6.95 Row 5 Observed 14 6 17 9 46 Expected 11.50 11.50 11.50 11.50 46.00 (O - E)² / E 0.54 2.63 2.63 0.54 6.35 Total
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