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Statistics Exam Questions?
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Statistics Exam Questions
Q.1. Generally, which one of the following is the least appropriate measure of central tendency for a data set that contains outliers?
1. Mean2. Median
3. 2nd quartile
4. 50th percentile
Ans.Mean
Statistics Exam Questions
Q. 2. The numerical value of the standard deviation can never be?
1. larger than the variance2. Zero
3. Negative
4. all of these statements are correct
Ans.Negative
Statistics Exam Questions
Q. 3. Which of the following symbols represents the standard deviation of the population?
1. σ2. Σ
3. μ
4. all of these are correct
Ans.Σ
Statistics Exam Questions
Q. 4. When should measures of location and dispersion be computed from grouped data rather than from individual data values?
1.as much as possible since computations are easier2. only when individual data values are unavailable
3. whenever computer packages for descriptive statistics are unavailable
4.only when the data are from a population
Ans.only when individual data values are unavailable
Statistics Exam Questions
Q. 5. In a recent study based upon an inspection of 200 homes in Daisy City, 120 were found to violate one or more city codes. The Daisy City study described above is an example of the use of a?
1. Census2. Sample
3. Probability
4. Population
Ans.Sample
Statistics Exam Questions
Q. 6. The average age in a sample of 90 students at City College is 20. As a result of this sample, it can be concluded that the average age of all the students at City College?
1. must be more than 20, since the population is always larger than the sample2. must be less than 20, since the sample is only a part of the population
3. could not be 20
4. could be larger, smaller, or equal to 20
Ans.could be larger, smaller, or equal to 20
Statistics Exam Questions
Q. 7. Dr. Kurt Thearling, a leading practitioner in the field, defines data mining as “the ___ extraction of ___ information from databases”.
1. thorough, insightful2. timely, accurate
3. automated, predictive
4. intentional, useful
Ans.automated, predictive
Statistics Exam Questions
Q. 8. Which of the following is NOT an example of a firm that sells or leases business database services to clients?
1. Dun & Bradstreet2. Bloomberg
3. U. S. Census Bureau
4. All of these answers are examples of firms that sell or lease business database services to clients.
Ans.U. S. Census Bureau
Statistics Exam Questions
Q. 9. For the Excel worksheet above, which of the following formulas would correctly calculate the joint probability for cell D3?
1. =SUM(B3:C3)2. B3+C3.
3. B3/C3
4. =B3*C3
Ans.=B3*C3
Statistics Exam Questions
Q. 10. If two events are mutually exclusive, then the probability of their intersection
1. will be equal to zero2. can have any value larger than zero
3. must be larger than zero, but less than one
4. will be one
Ans.will be equal to zero
Statistics Exam Questions
Q. 11. If a coin is tossed three times, the likelihood of obtaining three heads in a row is
1. Zero2. 0.500
3. 0.875
4. 0.125
Ans.0.500
Statistics Exam Questions
Q. 12. The variance of the sample
1. can never be negative2. can be negative
3. cannot be zero
4. cannot be less than one
Ans.can never be negative
Statistics Exam Questions
Q. 13. The descriptive measure of dispersion that is based on the concept of a deviation about the mean is
1. the range2. the interquartile range
3. both the range and the interquartile range
4. the standard deviation
Ans.the standard deviation
Statistics Exam Questions
Q. 14. The variance of a sample of 81 observations equals 64. The standard deviation of the sample equals
1. 02. 4096
3. 8
4. 6,561
Ans.8
Statistics Exam Questions
Q. 15. The sum of the relative frequencies for all classes will always equal
1. the sample size2. the number of classes
3. one
4. 100
Ans.one
Statistics Exam Questions
Q. 16.The ages of employees at a company represent
1. categorical data2. quantitative data
3. label data
4. time series data
Ans.quantitative data
Statistics Exam Questions
Q. 17. The number of sick days taken (per month) by 200 factory workers is summarized below.
| Number of Days | Frequency |
|---|---|
| 0 − 5 | 120 |
| 6 – 10 | 65 |
| 11 – 15 | 14 |
| 16 – 20 | 1 |
2. was 200
3. was 185
4. was 65
Ans.was 15
Statistics Exam Questions
Q. 18. The approximately class width for a frequency distribution involving quantitative data can be determined using the expression
1. mean frequency ÷ total frequency2. total frequency ÷ class midpoin
3. range ÷ desired number of classes
4. desired number of classes ÷ class midpoint
Ans.range ÷ desired number of classes
Statistics Exam Questions
Q. 19. The collection of all possible sample points in an experiment is
1. the sample space2. a sample point
3. an experiment
4. the population
Ans.the sample space
Statistics Exam Questions
Q. 20. The most frequently occurring value of a data set is called the
1. range2. mode
3. mean
4. None of the other answers are correct.t
Ans.mode
Statistics Exam Questions
Q. 21. Generally, which one of the following is the least appropriate measure of central tendency for a data set that contains outliers?
1. mean2. median
3. 2nd quartile
4. 50th percentile
Ans.mean
Statistics Exam Questions
Q. 22. The interquartile range is
1. the 50th percentile2. another name for the variance
3. the difference between the largest and smallest values
4. the difference between the third quartile and the first quartile
Ans.the difference between the third quartile and the first quartile
Statistics Exam Questions
Q. 23. Categorical data can be graphically represented by using a(n)
1. histogram2. frequency polygon
3. ogive
4. bar chart
Ans.bar chart
Statistics Exam Questions
Q. 24. The relative frequency of a class is computed by
1. dividing the midpoint of the class by the sample size.2. dividing the frequency of the class by the midpoint.
3. dividing the sample size by the frequency of the class.
4. dividing the frequency of the class by the sample size.
Ans.dividing the frequency of the class by the sample size.
Statistics Exam Questions
Q. 25. Which of the following variables use the ratio scale of measurement?
1. name of stock exchange2. time
3. SAT scores
4. Social Security number
Ans.SAT scores
Statistics Exam Questions
Q. 26. The sum of frequencies for all classes will always equal
1. 12. the number of elements in a data set
3. the number of classes
4. a value between 0 and 1
Ans.the number of elements in a data set
Statistics Exam Questions
Q. 27. Two events are mutually exclusive if
1. the probability of their intersection is 12. they have no sample points in common
3. the probability of their intersection is 0.5
4. the probability of their intersection is 1 and they have no sample points in common
Ans.they have no sample points in common
Statistics Exam Questions
Q. 28. Of the last 100 customers entering a computer shop, 25 have purchased a computer. If the classical method for computing probability is used, the probability that the next customer will purchase a computer is
1. 0.252. 0.50
3. 1.00
4. 0.75
Ans.0.50
Statistics Exam Questions
Q. 29. In an application for a credit card, potential customers are asked for their social security numbers. A social security number is an example of a
1. categorical variable2. quantitative variable
3. categorical or quantitative variable, depending on how the respondents answered the question
4. ratio variable
Ans.categorical variable
Statistics Exam Questions
Q. 30. Categorical data
1. are always nonnumeric2. may be either numeric or nonnumeric
3. are always numeric
4. indicate either how much or how many
Ans.may be either numeric or nonnumeric
Statistics Exam Questions
Q. 31. In statistical experiments, each time the experiment is repeated
1. the same outcome must occu2. the same outcome can not occur again
3. a different outcome may occur
4. None of the other answers is correct.
Ans.a different outcome may occur
Statistics Exam Questions
Q. 32. A perfectly balanced coin is tossed 6 times and tails appears on all six tosses. Then, on the seventh trial
1. tails cannot appear2. heads has a larger chance of appearing than tails
3. tails has a better chance of appearing than heads
4. None of the other answers is correct.
Ans.None of the other answers is correct.
Statistics Exam Questions
Q. 33. The probability of the occurrence of event A in an experiment is 1/3. If the experiment is performed 2 times and event A did not occur, then on the third trial event A
1. must occur2. may occur
3. could not occur
4. has a 2/3 probability of occurring
Ans.may occur
Statistics Exam Questions
Q. 34. A researcher has collected the following sample data.
| 5 | 12 | 6 | 8 | 5 |
| 6 | 7 | 5 | 12 | 4 |
2. 6
3. 7
4. 8
Ans.6
Statistics Exam Questions
Q. 35. Which of the following symbols represents the variance of the population?
1. σ2. μ
3. Σ
4. ξ
Ans.σ
Statistics Exam Questions
Q. 36. Excel's ____ function can be used to compute the sample correlation coefficient.
1. MAX2. COVAR
3. VAR
4. CORREL
Ans.CORREL
Statistics Exam Questions
Q. 37. The numerical value of the standard deviation can never be
1. larger than the variance2. zero
3. negative
4. all of these statements are correct
Ans.negative
Statistics Exam Questions
Q. 38. Excel's ____ function can be used to compute the mean.
1. MAX2. AVERAGE
3. MEDIAN
4. MODE
Ans.AVERAGE
Statistics Exam Questions
Q. 39. The probability of the intersection of two mutually exclusive events
1. can be any value between 0 to 12. must always be equal to 1
3. must always be equal to 0
4. can be any positive value
Ans.must always be equal to 0
Statistics Exam Questions
Q. 40. When the assumption of equally likely outcomes is used to assign probability values, the method used to assign probabilities is referred to as the
1. relative frequency method2. relative frequency method
3. probability method
4. classical method
Ans.classical method
Statistics Exam Questions
Q. 41. The symbol ∩ shows the
1. union of events2. intersection of events
3. sum of the probabilities of events
4. None of the other answers is correct.
Ans.intersection of events
Statistics Exam Questions
Q. 42. To construct a histogram using Excel's Chart Tools, choose ____ as the chart type.
1. column2. pie
3. scatter
4. line
Ans.column
Statistics Exam Questions
Q. 43. Data collected over several time periods are
1. time series data2. time controlled data
3. cross-sectional data
4. time dependent data
Ans.time series data
Statistics Exam Questions
Q. 44. In a cumulative frequency distribution, the last class will always have a cumulative frequency equal to
1. one2. 100%
3. the total number of elements in the data set
4. None of the other answers are correct.
Ans.the total number of elements in the data set
Statistics Exam Questions
Q. 45. A tabular summary of data showing the percentage of items in each of several nonoverlapping classes is a
1. frequency distribution2. relative frequency distribution
3. percent frequency distribution
4. cumulative percent frequency distribution
Ans.frequency distribution
Statistics Exam Questions
Q. 46. When the assumption of equally likely outcomes is used to assign probability values, the method used to assign probabilities is referred to as the
1. relative frequency method2. subjective method
3. probability method
4. classical method
Ans.classical method
Statistics Exam Questions
Q. 47. The probability of the occurrence of event A in an experiment is 1/3. If the experiment is performed 2 times and event A did not occur, then on the third trial event A
1. must occur2. may occur
3. could not occur
4. has a 2/3 probability of occurring
Ans.may occur
Statistics Exam Questions
Q. 48. The probability of at least one head in two flips of a coin is
1. 0.332. 0.50
3. 0.75
4. 1.00
Ans.0.75
Statistics Exam Questions
Q. 49. In computing the pth percentile, if the index i is an integer the pth percentile is the
1. data value in position i2. data value in position i + 1
3. average of data values in position i and i + 1
4. data value in position i-1
Ans.average of data values in position i and i + 1
Statistics Exam Questions
Q. 50. The ____ denotes the number of standard deviations xi is from the mean .
1. range2. median
3. z-score
4. third quartile
Ans.z-score
Statistics Exam Questions
Q. 51. Since the population size is always larger than the sample size, then the sample statistic
1. can never be larger than the population parameter2. can never be equal to the population parameter
3. can never be zero
4. None of the other answers are correct.
Ans.can never be zero
Statistics Exam Questions
Q. 52. A characteristic of interest for the elements is called a(n)
1. sample2. data set
3. variable
4. observation
Ans.variable
Statistics Exam Questions
Q. 53. The U.S. Census Bureau conducts a census every
1. 4 years2. 5 years
3. 8 years
4. 10 years
Ans.10 years
Statistics Exam Questions
Q. 54. A tabular method that can be used to summarize the data on two variables simultaneously is called
1. simultaneous equations2. a crosstabulation
3. a histogram
4. a dot plot
Ans.a crosstabulation
Statistics Exam Questions
Q. 55. The entities on which data are collected are
1. elements2. populations
3. sets
4. samples
Ans.elements
Statistics Exam Questions
Q. 56. In a recent study based upon an inspection of 200 homes in Daisy City, 120 were found to violate one or more city codes. The manager's statement that 60% of Daisy City's 3,000 homes are in violation of city codes is
1. an exactly correct statement2. only an approximation, since it is based upon sample information
3. obviously wrong, since it is based upon a study of only 200 homes
4. None of the other answers are correct.
Ans.only an approximation, since it is based upon sample information
Statistics Exam Questions
Q. 57. Which of the following graphical methods is most appropriate for categorical data?
1. ogive2. pie chart
3. histogram
4. scatter diagram
Ans.pie chart
Statistics Exam Questions
Q. 58. The set of measurements collected for a particular element is (are) called
1. census2. variables
3. observations
4. samples
Ans.observations
Statistics Exam Questions
Q. 59. Each individual outcome of an experiment is called
1. the sample space2. a sample point
3. an experiment
4. an individual
Ans.a sample point
Statistics Exam Questions
Q. 60. Of the last 100 customers entering a computer shop, 25 have purchased a computer. If the classical method for computing probability is used, the probability that the next customer will purchase a computer is
1. 0.252. 0.50
3. 1.00
4. 0.75
Ans.0.50
Statistics Exam Questions
Q. 61.If P(A) = 0.50, P(B) = 0.60, and P(A ∩ B) = 0.30; then events A and B are
1. mutually exclusive events2. not independent events
3. independent events
4. Not enough information is given to answer this question
Ans. not independent events
Statistics Exam Questions
Q. 62. Excel's ____ function can be used to compute the sample covariance.
1. MAX2. COVARIANCE.S
3. VAR
4. CORREL
Ans.VAR
Statistics Exam Questions
Q. 63. Since the population size is always larger than the sample size, then the sample statistic
1. can never be larger than the population parameter2. can never be equal to the population parameter
3. can never be zero
4. None of the other answers are correct.
Ans.can never be zero
Statistics Exam Questions
Q. 64. If P(A) = 0.80, P(B) = 0.65, and P(A ∪ B) = 0.78, then P(B∩A) =
1. 0.67002. 0.8375
3. 0.9750
4. Not enough information is given to answer this question
Ans.0.8375
Statistics Exam Questions
Q. 65. A method of assigning probabilities based upon judgment is referred to as the
1. relative method2. probability method
3. aclassical methodclassical method
4. None of the other answers is correct.
Ans.a sample point
Statistics Exam Questions
Q. 66. If a penny is tossed three times and comes up heads all three times, the probability of heads on the fourth trial is
1. smaller than the probability of tail2. larger than the probability of tails
3. 1/16
4. None of the other answers is correct.
Ans.None of the other answers is correct.
Statistics Exam Questions
Q. 67. The interquartile range is
1. the 50th percentile2. another name for the variance
3. the difference between the largest and smallest values
4. the difference between the third quartile and the first quartile
Ans.the difference between the third quartile and the first quartile
Statistics Exam Questions
Q. 68. The difference between the lower class limits of adjacent classes provides the
1. number of classes2. class limits
3. class midpoint
4. class width
Ans.class width
Statistics Exam Questions
Q. 69. A sample of five Fortune 500 companies showed the following industry codes: banking, banking, finance, retail, and banking. Based on this information, which of the following statements is correct?
1. Sixty percent of the sample of five companies are banking industries.2. Sixty percent of all Fortune 500 companies are banking industries.
3. Banking is the most common type of industry among all Fortune 500 companies.
4. If five other Fortune 500 companies were chosen, 60% of them would be banking industries.
Ans.Sixty percent of the sample of five companies are banking industries.
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