Download Practice Questions with Solutions - Statistics for Business Students | MATH 3339 and more Exams Statistics in PDF only on Docsity! NAVIGATION [4] Q 1 [4] Q 2 [4] Q 3 [6] Q 4 [6] Q 5 [6] Q 6 [0] Q 7 [0] Q 8 [0] Q 9 [0] Q 10 [0] Q 11 [0] Q 12 [0] Q 13 TEST INFORMATION Your Score is: 30 Out of: 30 Time Allowed: 75 min Total Problems: 13 COLORING LEGEND Not Answered Incorrect Correct You scored 30 out of 30 Question 1 Your answer is CORRECT. True or False: Let X be the random variable assigned to the amount of rainfall in your state 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 is doubled, the median will increase. a) True b) False Question 3 Your answer is CORRECT. True or False: If a density curve is skewed right, the mean will be greater than the median. a) True b) False Question 4 Your answer is CORRECT. An experimenter is randomly sampling 3 objects in order from among 42 objects. What is the total number of samples in the sample space? a) 11480 b) 206640 c) 54834 d) 9139 e) 68880 Question 5 Your answer is CORRECT. Records at the UH library show that 12% of all UH students check out books on history, 28% of all UH students check out books on science, and 6% 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) 0.40 b) 0.28 c) 0.60 d) 0.46 e) 0.34 Question 6 Your answer is CORRECT. Suppose that x is normally distributed with a mean of 20 and a standard deviation of 15. What is P(-7.45 ≤ x ≤ 54.95)? a) 0.956 b) 0.490 c) 0.468 d) 0.495 e) 0.466 Question 7 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. Problem Code: 753 A distribution of grades in an introductory statistics class (where A = 4, B = 3, etc) is: X 0 1 2 3 4 P(X) 0.11 0.17 0.24 0.32 ___ Part a: Find P(X = 4). Part b: Find P(1 ≤ X < 3) . Part c: Find the mean grade in this class.
