2/26/2014 Print Test 1/6 PRINTABLE VERSION Test 1 You scored 12 out of 24 Question 1 Your answer is CORRECT. True or False: Let X be the random variable assigned to the number of days it rained where you live last month. X is a continuous random variable. a) True b) False Question 2 Your answer is CORRECT. True or False: If the largest value in a data set that contains strictly positive values is doubled, the range will increase. a) True b) False Question 3 Your answer is INCORRECT. A researcher randomly selects 3 fish from among 10 fish in a tank and puts each of the 3 selected fish into different containers. How many ways can this be done? a) 90 b) 240 c) 2160 d) 2880
2/26/2014 Print Test 2/6 e) 720 Question 4 Your answer is CORRECT. Records at the UH library show that 16% of all UH students check out books on history, 20% of all UH students check out books on science, and 4% check out books on both history and science. What is the probability that a randomly selected UH student checks out a history book or a science book or both? a) 0.64 b) 0.40 c) 0.28 d) 0.32 e) 0.36 Question 5 Your answer is INCORRECT. Suppose that x is normally distributed with a mean of 60 and a standard deviation of 9. What is P( x ≥ 72.15)? a) 0.411 b) 0.093 c) 0.089 d) 0.911 e) 0.090 Question 6 Your answer is CORRECT. This is a written question, worth 10 points. DO NOT place the problem code on the answer sheet. A proctor will fill this out after exam submission. Show all steps (work) on your answer sheet for full credit.
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