RES342 - Week 4 Assignment- University of Phoenix

15.18 Sixty-four students in an introductory college economics class were asked how many credits they

had earned in college, and how certain they were about their choice of major. Research question:

At α = .01, is the degree of certainty independent of credits earned? Certainty

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 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 XXXXX XXXXX, XXXXX Morais, Steve

Olson, and Greg Corda.) Vehicles

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 High levels of cockpit noise in an aircraft can damage the hearing of pilots who are exposed to this

hazard for many hours. A Boeing 727 co-pilot collected 61 noise observations using a handheld

sound meter. Noise level is defined as “Low” (under 88 decibels), “Medium” (88 to 91 decibels), or “High” (92 decibels or more). There are three flight phases (Climb, Cruise, Descent). Research

question: At α = .05, is the cockpit noise level independent of flight phase? (Data are from

Capt. Robert E. Hartl, retired.) Noise

Noise Level Climb Cruise Descent Row Total

Low: 6 2 6 14

Medium: 18 3 8 29

High: 1 3 14 18

Col Total: 25 8 28 61

15.28 Can people really identify their favorite brand of cola? Volunteers tasted Coca-Cola Classic,

Pepsi, Diet Coke, and Diet Pepsi, with the results shown below. Research question: At α = .05, is

the correctness of the prediction different for the two types of cola drinkers? Could you identify

your favorite brand in this kind of test? Since it is a 2 × 2 table, try also a two-tailed two-sample

z test for π1 = π2 (see Chapter 10) and verify that z2 is the same as your chi-square statistic.Which

test do you prefer? Why? (Data are from Consumer Reports 56, no. 8 [August 1991], p. 519.)

Cola

Correct? Regular Cola Diet Cola Row Total

Yes, got it right: 7 7 14

No, got it wrong: 12 20 32

Col Total: 19 27 46

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