Midterm 1 (Fall 2005)

# Midterm 1 (Fall 2005) - What is the probability it rain or...

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Statistics Test 1 Prof. VanderHoff Fall 2005 All work must be shown on exam to receive credit. 1. [5] Students are classified into 8 majors and 3 classes. How many ways can a student be classified? 2. [6] The mean price of gas in NJ is \$3.28 per gallon and the standard deviation is \$.25. What is the probability of finding a station selling gas for less than \$3.03? 3. [6] The mean time to commute is 36 minutes; the standard deviation is 7 minutes. The mean price of coffee is \$1.22 and the standard deviation is \$.15. Is commute time or coffee more variable? 4. [37] Calculate the statistics below using the following data from a sample: 7 2 -1 4 3 0 2 1 9 3 Mean: Median Mode Range Variance Standard deviation Z score for X= -1 Z score for X=10

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5. [5] The probability that U skips class is .2. The probability that U skips class and the class is stat is .05. What is the probability the class is stats given U missed the class? 6. [5] The probability that it rains is .3; the probability that it is warm is .4; The probability that it rains and is warm is .2.
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Unformatted text preview: What is the probability it rain or is warm or both? 7. [10] A class contains 10 seniors, 10 juniors and 5 sophomores. Assuming students are chosen at random without replacement, what is the probability that 1 senior is chosen a senior then a junior are chosen a senior and a sophomore are chosen 8. [5] The probability that the Jets win is .7. The probability that the Giants win is .6. The probability that both the Jets and the Giants win in .45. Are Jets win and Giants win independent? 9. [10] Use the following information to compute U’s average commute time? TIME NUMBER of TRIPS 30 2 35 20 40 13 45 4 50 1 10. [5] The mean drive time is 30 minutes. The standard deviation is 4. About 95% of drive times are between _______ and _______. 11. [6] What is the standard deviation of reward points from the following sample of students? reward points-11 24 14...
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Midterm 1 (Fall 2005) - What is the probability it rain or...

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