371-EXAM3A - Name Seat and Row MSCI 3710.001 SPALDING EXAM...

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Name Seat and Row MSCI 3710.001 EXAM 3A SPALDING FALL 96 Clearly indicate, in the right hand corner of your scantron, the version of the exam you are doing (Version A, B, C, etc.). Case Study I. Questions 1 to 5: A traffic engineer observed that of the 200 vehicles arriving at an intersection, 48 turned right, 33 turned left, and the rest proceeded straight ahead. Test the null hypothesis that the probability that a car turns right is 0.3 and that it turns left is 0.2. Test the hypothesis at the 5 percent level of significance. Let P R , P L , P S denote, respectively, the probability that a car turns right, left, or proceeds straight. 1. Set up the null and alternative hypothesis. A. Ho: P R = 0.3 Ha: P R not = 0.3 B. Ho: P S = 0.5 Ha: P S not = 0.5 C. Ho: P L = 0.2, P S = 0.5 Ha: P L not = 0.2, P S not = 0.5 D. Ho: P R = 0.3, P L = 0.2, P S = 0.5 Ha: P R not = 0.3, P L not = 0.2, P S not = 0.5 E. none of the above 2. Identify the rejection region; that is, Ho will be rejected if the computed test statistic is: A. greater than 3.84146 B. greater than 5.99147 C. greater than 5.02389 D. greater than 7.37776 E. none of the above 3. What is the calculated value of χ 2 ? A. 2.40 B. 1.23 C. 7.24 D. 5.21 E. 4.27
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4. What is the number of the degrees of freedom (df) ? A.
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This note was uploaded on 03/09/2011 for the course DSCI 2710 taught by Professor Hossain during the Spring '08 term at North Texas.

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371-EXAM3A - Name Seat and Row MSCI 3710.001 SPALDING EXAM...

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