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QMB 3200 Exam Test Questions and Answers (Verified Answers) 1.What is the z score formula ANS (the observation - mean) / standard deviation 2.What does a z score tell us ANS how many standard deviations a value of from the mean 3.How do you find the range ANS biggest value minus smallest value 4.What is the formula used in excel to find the range ANS =max(array) - min (array) 1 / 3
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5.If a data set has an odd number of observations, the median a.Cannot be determined b.is the value of the middle item when all items are arranged in ascending order c.is the average value of the two middle items when all items are arranged in ascending order.d.must be equal to the mean
ANS: B. is the value of the middle item when all items are arranged in
ascending order 6.Which of the following represents the data point that occurs most frequently in a set of observations?a.Mean b.Mode c.All of these choices are correct d.Median
ANS: B. Mode 2 / 3
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7.The median of a data set is represented by the:
a.50th percentile b.75th percentile c.100th percentile d.25th percentile
ANS: A. 50th percentile
8.Which of the following is a possible reason for an outlier in a data set?a.A mistake was made while taking a measurement or entering it into the computer b.The individual in question belongs to a different group than the bulk of individuals measured c.The outlier is a legitimate data value and represents natural variability for the group and variables measured d.All of these choices are possible reasons for an outlier
ANS: D. All of these choices are possible reasons for an outlier
9.The following is the frequency distribution for the ages of a sample of
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