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STAT 1124 Mid Term 3 Model Answers

STAT 1124 Mid Term 3 Model Answers - Page 1 STAT 1124...

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Page 1 STAT 1124 Section 2 Name: Mid Term 3 Student ID: March 25, 2009 Model Answers You have 55 minutes to complete the test. The total number of points is 20 1. In a research study for cell phone usage while driving, one of the key research questions is whether there is a relationship between the use of cell phone while driving and the number of years of driving experience. Below is a summary of the data obtained: Years of Driving Experience Use Cell Phone While Driving Less than 5 Between 5 and 10 Over 10 Yes 55 25 20 100 No 24 35 26 85 79 60 46 185 a. Find the expected frequency for the cell, No/Between 5 and 10 years? ( 2 Point ) EC = (60 * 85)/185 = 27.57 b. If the Chi- Square Statistic for this table is 13.486, what conclusion can you draw on the relationship between the use of cell phone while driving and the number of years of driving experience? Answer without a full justification using the Chi-Square analysis technique will not earn any points. ( 3 Points ) Degree of Freedom = (3 - 1) * (2 - 1) = 2 Decision Point = 5.99 Since the Chi-Square statistic (13.486) > 5.99, we can conclude that there is a statistically significant relationship (association) between the use of cell phone while driving and the number of years of driving experience.

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