2. The value of the middle term in a ranked data set is called: A) the mean B) the standard deviation C) the mode D) the median


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1 1. An outlier is a value that is: A) very small or very large relative to the majority of the values in a data set B) either 100 units smaller or 100 units larger relative to the majority of the values in a data set C) greater than the mean of a data set D) none of these 2. The value of the middle term in a ranked data set is called: A) the mean B) the standard deviation C) the mode D) the median The annual salaries of six employees of a company are as follows: $22,000 $35,000 $22,000 $46,000 $57,000 $72, The mean salary of these employees is: A) $42,333 B) $40,500 C) $53,000 D) $22, The median salary of these employees is: A) $42,330 B) $40,500 C) $53,000 D) $22, The mode of salaries for these employees is: A) $42,330 B) $40,500 C) $53,000 D) $22,000 Page 1
2 6. The measurement units of the variance are always: A) the same as those of the original data B) the square of the measurement units of the original data C) 50% of the measurement units of the original data D) none of these 7. The quartiles divide a ranked data set into: A) 2 equal parts B) 4 equal parts C) 100 equal parts D) 10 equal parts The waiting times (in minutes) for 11 customers at a supermarket are 13, 9, 5, 15, 4, 7, 9, 11, 14, 2, and The first quartile for these data is: A) 11 B) 5 C) 6 D) 7 9. The second quartile for these data is: A) 13 B) 11 C) 5 D) The third quartile for these data is: A) 11 B) 13 C) 9 D) The approximate value of the 60th percentile for these data is: A) 13 B) 7 C) 11 D) 9 Page 2
3 12. The percentile rank of the customer who waited six minutes is: A) B) C) D) Which of the following does a boxandwhisker plot not show? A) spread of the data B) percent of the data within two standard deviations of the mean C) center of the data set D) skewness of the data set 14. The pointspergame totals for a particular basketball league over a single season has a mean of 155 and a variance of 36. Using Chebyshev's theorem, the percentage of games in which between 143 and 167 points were scored is at least: A) 25% B) 50% C) 75% D) 100% 15. You collect the following data, which represent a bank's certificate of deposit (CD) rates in each of the last 12 weeks. 4.74% 4.68% 4.88% 4.95% 4.90% 5.01% 4.96% 4.99% 5.11% 5.08% 5.15% 5.08% What is the coefficient of variation of these data? A).417% B).029% C) 2.9% D) 1.554% 16. A compound event includes: A) at least three outcomes B) at least two outcomes C) one and only one outcome D) all outcomes of an experiment Page 3
4 17. A box contains a few red and a few white marbles. Two marbles are randomly drawn from this box and the color of these marbles is observed. The total number of outcomes for this experiment is: A) eight B) four C) six D) two 18. The numerical measure of the likelihood that a specific event will occur is called: A) the sample space B) a sample point C) an event D) the probability of an event 19. The classical probability approach is applied to an experiment that: A) cannot be repeated B) has equally likely outcomes C) does not have more than two outcomes D) has all independent outcomes 20. The conditional probability of event A given that event B has already occurred is written as: A) P(A or B) B) P(B A) C) P(A and B) D) P(A B) 21. The marginal probability is the probability of: A) a sample space B) an outcome when another outcome has already occurred C) an event without considering any other event D) an experiment calculated at the margin The following table gives the twoway classification of 500 students based on sex and whether or not they suffer from math anxiety. Page 4
5 Suffer From Math Anxiety Gender Yes No Male Female If one student is randomly selected from these 500 students, the probability that this selected student is a female is: A).480 B).653 C).520 D) If one student is randomly selected from these 500 students, the probability that this selected student suffers from math anxiety is: A).670 B).275 C).333 D) If one student is randomly selected from these 500 students, the probability that this selected student suffers from math anxiety given that he is a male is approximately: A).333 B).673 C).327 D) If one student is randomly selected from these 500 students, the probability that this selected student is a female given that she does not suffer from math anxiety is approximately: A).649 B).327 C).889 D) Events "Yes" and "No" are: A) mutually exclusive events B) mutually nonexclusive events C) subjective events D) conditional events Page 5
6 27. The joint probability of two events A and B is that: A) either event A happens or event B happens B) neither of the events A and B happens C) both events A and B happen D) none of these 28. The probability that a randomly selected college student is a parttime student is.18. The probability of the complementary event of this event is: A).18 B).64 C).82 D) cannot find 29. When rolling a pair of fair dice, what is the probability that the sum of the dice on one roll will be seven? A) 1/6 B) 1/12 C) 1/36 D) 5/ An experiment is conducted with 50 dogs. Each dog is given a dish of dry dog food and a dish of canned dog food at the same time, and the food that is eaten first is considered the "preferred" food. The dogs are classified as small (under 40 lbs.), medium ( lbs.), and large (over 100 lbs.). The results are tabulated as follows: Preferred Dry Preferred Canned Small Dogs 2 18 Medium Dogs 7 13 Large Dogs 4 6 What is the probability that a dog chosen at random from the group will be large and will prefer canned food? A) 6/10 B) 6/37 C) 4/50 D) 6/50 Page 6
7 31. Four fair dice are rolled. What is the probability that all 4 dice show the same number? A) 1/24 B) 1/216 C) 1/1296 D) 1/6 32. A boy is playing an adventure game. At one point, he has to make a decision to go right or go left. If he goes right, the probability that he will "die" is.30. If he goes left, the probability of "death" is.40. He has an equal probability of choosing either direction. What is the probability that he will "die" after making his decision? A).12 B).70 C).40 D) All 400 employees at an accounting firm are asked what size of vehicle they drive: compact car, midsize car, large car, or truck. The following table gives a twoway classification of their responses. Compact Car MidSize Car Large Car Truck Male Female If one employee is selected at random, what is the most likely outcome? A) The employee is a male and drives a midsize car B) The employee is a female and drives a midsize car C) The employee is a male and doesn't drive a midsize or large car D) The employee is a female and doesn't drive a compact or midsize car 34. A game is played with a fair die and bag of marbles. The player rolls the die, and if the number on the die is above four, then the player may draw from the bag of marbles. The player wins if a black marble is drawn from the bag, which contains seven white marbles and three black marbles. If the number on the die is four or less, the player loses without drawing from the bag. What is the probability of winning the game? A).33 B).30 C).63 D).10 Page 7
8 35. The probability that a randomly selected person from a certain community has been on the Internet and can point out the location of Guinea on a world map is.08, and the probability that the person can point out Guinea given that he/she has been on the Internet is.20. What is the probability that a person in the community has been on the Internet? A).40 B).016 C).80 D) 2.50 Page 8
9 Answer Key 1. A 2. D 3. A 4. B 5. D 6. B 7. B 8. B 9. D 10. B 11. D 12. C 13. C 14. C 15. C 16. B 17. B 18. D 19. B 20. D 21. C 22. C 23. A 24. D 25. D 26. A 27. C 28. C 29. A 30. D 31. B 32. D 33. C 34. D 35. A Page 9
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