Quiz 1 Key

# Quiz 1 Key - QUIZ 1 BIT 2405 February 5 2009 Solutions...

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QUIZ 1- BIT 2405- February 5, 2009 Solutions highlighted Question 1 Gasoline prices in the state of Virginia were sampled this summer and determined to have an average price of \$3.25/gallon with a standard deviation of \$.15. A particular Texas gas station advertises gasoline for \$4.00/gallon. Interpret the z-score for this gas station. 1. The gas price of this station falls 4 standard deviations above the mean gas price of all Virginia gas stations. 2. The gas price of this station falls 3 standard deviations above the mean price of \$0. 3. The gas price of this Texas station falls 5 standard deviations below the mean gas price of 4. Virginia stations. 5. The gas price of this station falls 5 standard deviations above the mean gas price of all Virginia stations. Question 2 State Highway Patrol measured the speed of 120 cars driving on the I-81 highway by radar gun. The average speed was determined to be 65 miles per hour. The standard deviation of the speeds was 10 mph. Which of the following car speeds would be classified as outliers? 1. 94 mph 2. 97 mph 3. 78 mph 4. 82 mph Question 3 Which is better: a score of 82 on a test with a mean of 70 and a standard deviation of 8, or a score of 82 on a test with a mean of 75 and a standard deviation of 4?

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Quiz 1 Key - QUIZ 1 BIT 2405 February 5 2009 Solutions...

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