Midterm 1 (2007)

Midterm 1 (2007) - Statistics Test 1 Prof VanderHoff SPRING...

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Statistics Test 1 Prof. VanderHoff SPRING 2007 All work must be shown on exam to receive credit. 1. [5] The probability that A occurs is .4. The probability that B occurs is .6. The probability that A and B occur is .3. Are A and B independent? 2. [5] The average time it takes to travel from here to there is 30 minutes. The standard deviation is 5 minutes. About 68% of trips take within what range of times? 3. [8] Calculate the grade point average using the following data: grade credits 4 40 3 30 2 10 1 0 0 10 4. [30] Calculate the statistics below using the following data from a sample: 1 7 3 -2 6 2 1 5 6 1 Mean: Median Mode Range Variance Standard deviation Coefficient of variation

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5. [7] The grab bag contains 5 snickers, 10 baby ruths and 15 mars bars. What the probability of blindly picking two and both are baby ruths? 6. [5] What is the z score for x=20, when the mean of x=15 and the standard deviation of x = 5? 7. [8] The probability that elevator 1 works is .9; the probability elevator 2 works is .95.
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Midterm 1 (2007) - Statistics Test 1 Prof VanderHoff SPRING...

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