Question 145214: Can someone help me please with this chi- square questions?
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 Steve Bennett, Alicia 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),
Sport Graduate in 6 Years Not Graduate in 6 Years Row Total
Tennis 42 16 58
Swimming 116 51 167
Soccer 35 17 52
Gymnastics 40 23 63
Golf 30 21 51
Track 97 69 166
Football 267 317 584
Wrestling 70 87 157
Baseball 77 98 175
Hockey 39 66 105
Basketball 36 61 97
Other 18 5 23
Col Total 867 831 1,698
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
Smoking by Race for Males Aged 18–24
Race Smoker Nonsmoker Row Total
White 145 280 425
Black 15 60 75
Col Total 160 340 500
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! 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
------------------
Ho: certainty and credits are independent
Ha: they are dependent
--------------
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
---------------
I ran a Chi-Sq Test on the 3 x 3 data set to get:
Chi-Sq = 14.7638...
p-value = 0.00522...
---------------
Conclusion: Since P-value is less than 1%, Reject Ho.
Certainty and credits are dependent
=========================
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.) 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
-------------
Ho: parking and vehicle type are independent
Ha: they are dependent
-----------------------------
I ran a Chi-Sq Test on the 5x4 set of data with a TI calculator and
got the following:
Chi-Sq = 24.53154...
p-value = 0.017201..
----------
Conclusion: Since p-value is less than 5%, reject Ho.
parking place and vehicle type are dependent
------------
Cheers,
Stan H.
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