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31. A ______________ shows the relationship between two variables
A. Box plot
B. Bar chart
D. Scatter Plot
E. Pie chart
32. In a given data set the 25th percentile is _______________ equal the lower hinge.
33. An airline company is, on average, late 10 minutes for arrivals. If the variance for the lateness statistic is
9, then the coefficient of variation is _____.
34. _____________ are used to describe qualitative (categorical) data.
A. Stem and leaf displays and scatter plots.
B. Scatter plots and box plots
C. Box plots and bar charts
D. Bar charts and pie charts
E. Pie charts and histograms
35. Which of the following is influenced the least by the occurrence of extreme values in a sample?
D. Geometric mean
E. Weighted mean
36. If a population distribution is positively skewed (to the right), then, given a random sample from that
population, one would expect that the _____
A. median would be greater than the mean.
B. mode would be equal to the mean.
C. median would never equal the mode.
D. median would be equal to the mean.
E. median would be less than the mean.
37. If a statistics course is determined by three exams. Exam 1 is worth 25% of the course grade. Exam 2 is
worth 35% of the course grade. Exam 3 is worth 40% of the course grade. Calculate the term grade for a
student with a 52% for the first exam, 63% for the second exam, and 75% for the third exam.
38. If the mean, median, and mode for a given population all equal 25, then we know that its distribution is
B. Skewed to the right
D. Skewed to the left
39. If one intends to compare the relative variation between two samples involving two different quantitative
variables with different measurement scales, then the most appropriate way is to compare the two
A. Standard deviations
C. Coefficient of variations
E. Interquartile ranges
40. A disadvantage of using grouping (a frequency table) with sample data is that:
Calculations involving central tendency and variation are more complicated than central tendency and
variation calculations based on ungrouped data.
B. The descriptive statistics are less precise than the descriptive statistics obtained using ungrouped data.
C. The interpretation of the grouped data descriptive statistics is meaningless.
D. It is much more difficult to summarize the information than it is with the ungrouped data.
E. It is more difficult to interpret a pie chart.
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