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Midterm 1 (Fall 2006)

Midterm 1 (Fall 2006) - the probability that the class ends...

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Statistics Test 1 Prof. VanderHoff FALL 2006 All work must be shown on exam to receive credit. 1. [5] The mean commute time is 37 minutes. The standard deviation is 6. About 95 % of commute times are between ______ and _______. 2. [8] Tiger Woods golf score averages 68 and has a standard deviation of 4. The number of students attending stat class averages 45 with a standard deviation of 3. Is the golf score or class attendance more variable? Why? 3. [7] A bowl contains 30 red jelly beans, 55 white jelly beans and 15 white jelly beans. What the probability that you pick 3 red jelly beans? 4. [7] The probability that class ends early is .3. The probability that the alarm goes off in the classroom is .2. The events class ends early and the alarm goes off are independent. What is
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Unformatted text preview: the probability that the class ends early or the alarm goes off? 5. [30] Calculate the statistics below using the following data from a sample: 1 2-3 2 5 4 5 2 Mean: Median Mode Range Variance Standard deviation 6. [8] What is the expected number of books read by a students during the year. The distribution of books read is: booksProbability 25 0.4 50 0.1 75 0.3 100 0.2 7. [10] The probability that the RU-N mens’ soccer team wins is .8. The probability that the RU-N womens’ team wins is .75. Each team will play a game tomorrow. List the possible number of wins for the two games and their probabilities. 8. [25] Calculate the mean and standard deviation of X using the following sample: X 30 20 50 40 25 45 Given your calculations, what is the value of z when x=42?...
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