document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=145214>Question 145214</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Can someone help me please with this chi- square questions?\r<BR>\n" );
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document.write( "15.18 Sixty-four students in an introductory college economics class were asked how many credits they\r<BR>\n" );
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document.write( "had earned in college, and how certain they were about their choice of major. Research question:\r<BR>\n" );
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document.write( "At &#945; = .01, is the degree of certainty independent of credits earned? Certainty\r<BR>\n" );
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document.write( "Credits Earned Very Uncertain Somewhat Certain Very Certain Row Total\r<BR>\n" );
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document.write( "0–9 12 8 3 23\r<BR>\n" );
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document.write( "10–59 8 4 10 22\r<BR>\n" );
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document.write( "60 or more 1 7 11 19\r<BR>\n" );
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document.write( "Col Total 21 19 24 64\r<BR>\n" );
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document.write( "15.22 A student team examined parked cars in four different suburban shopping malls. One hundred vehicles\r<BR>\n" );
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document.write( "were examined in each location. Research question: At &#945; = .05, does vehicle type vary by\r<BR>\n" );
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document.write( "mall location? (Data are from a project by MBA students Steve Bennett, Alicia Morais, Steve\r<BR>\n" );
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document.write( "Olson, and Greg Corda.) Vehicles\r<BR>\n" );
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document.write( "Vehicle Type Somerset Oakland Great Lakes Jamestown Row Total\r<BR>\n" );
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document.write( "Car 44 49 36 64 193\r<BR>\n" );
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document.write( "Minivan 21 15 18 13 67\r<BR>\n" );
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document.write( "Full-sized Van 2 3 3 2 10\r<BR>\n" );
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document.write( "SUV 19 27 26 12 84\r<BR>\n" );
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document.write( "Truck 14 6 17 9 46\r<BR>\n" );
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document.write( "Col Total 100 100 100 100 400\r<BR>\n" );
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document.write( "15.24 High levels of cockpit noise in an aircraft can damage the hearing of pilots who are exposed to this\r<BR>\n" );
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document.write( "hazard for many hours. A Boeing 727 co-pilot collected 61 noise observations using a handheld\r<BR>\n" );
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document.write( "sound meter. Noise level is defined as “Low” (under 88 decibels), “Medium” (88 to 91 decibels),\r<BR>\n" );
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document.write( "Sport Graduate in 6 Years Not Graduate in 6 Years Row Total\r<BR>\n" );
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document.write( "Tennis 42 16 58\r<BR>\n" );
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document.write( "Swimming 116 51 167\r<BR>\n" );
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document.write( "Soccer 35 17 52\r<BR>\n" );
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document.write( "Gymnastics 40 23 63\r<BR>\n" );
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document.write( "Golf 30 21 51\r<BR>\n" );
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document.write( "Track 97 69 166\r<BR>\n" );
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document.write( "Football 267 317 584\r<BR>\n" );
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document.write( "Wrestling 70 87 157\r<BR>\n" );
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document.write( "Baseball 77 98 175\r<BR>\n" );
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document.write( "Hockey 39 66 105\r<BR>\n" );
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document.write( "Basketball 36 61 97\r<BR>\n" );
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document.write( "Other 18 5 23\r<BR>\n" );
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document.write( "Col Total 867 831 1,698\r<BR>\n" );
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document.write( "Vehicle Type Somerset Oakland Great Lakes Jamestown Row Total\r<BR>\n" );
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document.write( "Car 44 49 36 64 193\r<BR>\n" );
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document.write( "Minivan 21 15 18 13 67\r<BR>\n" );
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document.write( "Full-sized Van 2 3 3 2 10\r<BR>\n" );
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document.write( "SUV 19 27 26 12 84\r<BR>\n" );
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document.write( "Truck 14 6 17 9 46\r<BR>\n" );
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document.write( "Col Total 100 100 100 100 400\r<BR>\n" );
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document.write( "Smoking by Race for Males Aged 18–24\r<BR>\n" );
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document.write( "Race Smoker Nonsmoker Row Total\r<BR>\n" );
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document.write( "White 145 280 425\r<BR>\n" );
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document.write( "Black 15 60 75\r<BR>\n" );
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document.write( "Col Total 160 340 500\r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #105908 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=105908\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 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. <BR>\n" );
document.write( "Research question: At &#945; = .01, is the degree of certainty independent of credits earned? Certainty <BR>\n" );
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document.write( "Ho: certainty and credits are independent<BR>\n" );
document.write( "Ha: they are dependent<BR>\n" );
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document.write( "Credits Earned Very Uncertain Somewhat Certain Very Certain Row Total <BR>\n" );
document.write( "0–9 12 8 3 23 <BR>\n" );
document.write( "10–59 8 4 10 22 <BR>\n" );
document.write( "60 or more 1 7 11 19 <BR>\n" );
document.write( "Col Total 21 19 24 64<BR>\n" );
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document.write( "I ran a Chi-Sq Test on the 3 x 3 data set  to get:<BR>\n" );
document.write( "Chi-Sq = 14.7638...<BR>\n" );
document.write( "p-value = 0.00522...<BR>\n" );
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document.write( "Conclusion: Since P-value is less than 1%, Reject Ho.<BR>\n" );
document.write( "Certainty and credits are dependent<BR>\n" );
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document.write( "15.22 A student team examined parked cars in four different suburban shopping malls. One hundred vehicles were examined in each location.<BR>\n" );
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document.write( "Research question: At &#945; = .05, does vehicle type vary by mall location? <BR>\n" );
document.write( "(Data are from a project by MBA students Steve Bennett, Alicia Morais, Steve <BR>\n" );
document.write( "Olson, and Greg Corda.) Vehicles \r<BR>\n" );
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document.write( "Vehicle Type Somerset Oakland Great Lakes Jamestown Row Total <BR>\n" );
document.write( "Car 44 49 36 64 193 <BR>\n" );
document.write( "Minivan 21 15 18 13 67 <BR>\n" );
document.write( "Full-sized Van 2 3 3 2 10 <BR>\n" );
document.write( "SUV 19 27 26 12 84 <BR>\n" );
document.write( "Truck 14 6 17 9 46 <BR>\n" );
document.write( "Col Total 100 100 100 100 400 <BR>\n" );
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document.write( "Ho: parking and vehicle type are independent<BR>\n" );
document.write( "Ha: they are dependent<BR>\n" );
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document.write( "I ran a Chi-Sq Test on the 5x4 set of data with a TI calculator and <BR>\n" );
document.write( "got the following:<BR>\n" );
document.write( "Chi-Sq = 24.53154...<BR>\n" );
document.write( "p-value = 0.017201..<BR>\n" );
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document.write( "Conclusion: Since p-value is less than 5%, reject Ho.<BR>\n" );
document.write( "parking place and vehicle type are dependent <BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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