11. Which of the following is not a measure of central location? a. mean b. median c. variance d. mode e. None of the above answers is correct. 12. If a data set has an even number of observations, the median a. can not be determined b. is the average value of the two middle items c. must be equal to the mean d. is the average value of the two middle items when all items are arranged in ascending order e. None of the above answers is correct. 13. The value that has half of the observations above it and half the observations below it is called the a. range b. median c. mean d. mode e. None of the above answers is correct. 14. The most frequently occurring value of a data set is called the a. range b. mode c. mean d. median e. None of the above answers is correct.
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In a unimodal negatively-skewed frequency distribution, Select one: a. mean is less than mode, and mode = median b. mean is less than median, and median is less than mode c. mean is greater than mode, and mode is greater than median d. mean is less than mode, and mode is less than median e. mean is less than median, and median = mode When measurement is made on Ranked scale, the appropriate measure of Central Tendency is: Select one: a. Mean b. Mid-Range c. Median d. Variance e. Mode Measurements made on which of the following scales has the largest information: Select one: a. Nominal b. Interval c. Ranked and Interval d. Ratio e. Ranked Which of the following may not have a unique value: Select one: a. Mode b. Mean c. Mid-Range d. Range e. Variance Among twenty-five parts produced by a machine, eight are defective, six having only minor defects and two having major defects. The probability that a part selected at random has major defects given that it has defects. Select one: a. 2/6 b. 8/25 c. 6/8 d. 2/8 e. 2/25 Which one of the following is computed using values of all observations: Select one: a. Mid-Range b. Variance c. Mode d. Range e. Median The median of 6 observations is 21. If the highest score increases by 3 points, the median will become Select one: a. 24 b. 9 c. 21 d. 21.5 e. Cannot be determined without additional information The following set of scores is obtained on a test, X: 4, 6, 8, 9, 11, 13, 16, 24, 24, 24, 26. The teacher computes all of the descriptive indices of central tendency and variability on these data, then discovers that an error was made, and one of the 24's is actually a 17. Which of the following indices will be changed from the original computation? Select one: a. Mode b. All: Median, Mode, Range, and Standard deviation c. Median d. Range e. Standard deviation
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14. Which of the following statements about the median is not true? (a) It is less affected by extreme values than the mean. (b) It is a measure of central tendency. (c) It is equal to the second quartile. (d) It is less than 25% of the ranked data. 15. Which of the following statements about the mean is not true? (a) It is less affected by extreme values than the median. (b) It is a measure of central tendency. (c) It is always unique in the sample. (d) It is equal to the median in symmetric distributions. 16. Which of the following statements about the mode is not true? (a) It is not affected by extreme values. (b) It is a measure of central tendency. (c) It is always unique in the sample. (d) can be found for categorical data. 17. The number of students in stat. exam is an example of a (a) discrete variable (b) continuous variable (c) ordinal variable (d) nominal variable 18. A summary measure that is computed from a population is called: (a) a parameter (b) a population (c) a discrete variable (d) a statistic 19. Given categorical data A, E, C, D, F, B, B, A, C, B, E, B , in pie chart the angle value for B is (a) 45° (b) 90° (c) 180° (d) 120° 20. The grades of 31 students are given by A , B , C , D , F with frequencies 3, 10, 8, 8, 2 respectively, then the median and the mode of the grades, respectively are (a) median=C , mode=B (b) median=B , mode=C
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Choose the correct answer below. A. The mean, median, and mode are the most important measures of center. The mean of a data set is the product of the observations divided by the number of observations. The median of a data set is the lowest value in its ordered list. The mode of a data set is its least frequently occurring value. B. The sample size, median, and mode are the most important measures of center. The sample size of a data set is the difference between the highest value and lowest value in its ordered list. The median of a data set is its most frequently occurring value. The mode of a data set is sum of the observations divided by the number of observations. C. The mean, sample size, and mode are the most important measures of center. The mean of a data set is the sum of the observations divided by the middle value in its ordered list. The sample size of a data set is the number of observations. The mode of a data set is its highest value in its ordered list. D. The mean, median, and mode are the most important measures of center. The mean of a data set is its arithmetic average. The median of a data set is the middle value in its ordered list. The mode of a data set is its most frequently occurring value.
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