DATA ANALYSIS 68 Assuming the heights of professional male tennis players follow a bell-shaped...
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DATA ANALYSIS 68 Assuming the heights of professional male tennis players follow a bell-shaped distribution, arrange in ascending order: I. A height with a z-score of 1. II.A height with a percentile rank of 80%. III.A height at the third quartile Q3. A. I, II, III B. I, III, II C. II, I, III D. III, I, II E. III, II, I
DATA ANALYSIS 68 Assuming the heights of professional male tennis players follow a bell-shaped distribution, arrange in ascending order: I.A height with
DATA ANALYSIS 68 Assuming the heights of professional male
tennis players follow a bell-shaped distribution, arrange in
ascending order: I.A height with a z-score of 1. II.A height with a
percentile rank of 80%. III.A height at the third quartile Q3. A.
I, II, III B. I, III, II C. II, I, III D. III, I, II E. III, II,
I
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DATA ANALYSIS 69 Suppose the scores on an exam have a mean of
75 with a standard deviation of 8. If one student has a test result
with a z-score of -1.5, and a second student has a test result with
a z-score of 2.0, how many points higher was the second students
result than that of the first? A. 3.5B. 4C. 12D. 16E. 28
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DATA ANALYSIS 70 Which of the following statements about
influential points are true? I.Looking at a residual plot is an
excellent way of picking out influential points. II.Removal of an
influential point sharply affects the regression line.
III.Determining a regression model with and without a point is an
excellent way of picking out influential points. A. I and II B. I
and III C. II and III D. I, II, and III E. None of the above gives
the complete set of true responses.
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DATA ANALYSIS 71 Given this cumulative frequency plot, what can
be said about the value of the mean?
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A. Between 10 and 15 B. Between 15 and 20 C. 20 D. More than 20
E. From such a plot, one can determine the median, but nothing can
be concluded about the mean.
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DATA ANALYSIS 72 Consider the points (-1,4), (2, 10), (4, 15),
(7, 21), (10, n). What should n be so that the correlation between
the x and y values is r =1 ? A. 26 B. 27 C. 28 D. A value different
from any of the above. E. No value for n can make r =1.
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DATA ANALYSIS 73 A random sample of students from each of two
schools was asked how many Supreme Court Justices they could name.
The results are given in the two histograms:
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Which school has the greater median with regard to the number
of Justices students could name, and which school has the greater
mean? A. Greater median: AGreater mean: A B. Greater median:
AGreater mean: B C. Greater median: BGreater mean: A D. Greater
median: BGreater mean: B E. Greater median: BEqual means
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DATA ANALYSIS 74 Suppose that the scatterplot of log X and log
Y shows a strong positive correlation close to 1. Which of the
following is true? I.The variables X and Y will also have a
correlation close to 1. II.A scatterplot of the variables X and Y
will show a strong nonlinear pattern. III.The residual plot of the
variables X and Y will show a random pattern. A. I only B. II only
C. III only D. I and II E. I, II, and III
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DATA ANALYSIS 75 Which of the following are true statements?
I.If the sample has variance zero, the variance of the population
is also zero. II.If the population has variance zero, the variance
of the sample is also zero. III.If the sample has variance zero,
the sample mean and sample median are equal. A. I and II B. I and
III C. II and III D. I, II, and III E. None of the above gives the
complete set of true responses.
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DATA ANALYSIS 76 Consider the three correlations depicted
below. Which of the statements on the following slide gives a
proper ordering?
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A. r < r < r B. r < r < r C. r < r < r <
|r | D. r < r < |r | E. r < r < r < |r |
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DATA ANALYSIS 77 Four pairs of data are used in determining a
regression line y = -2 + 6x. If the four values of the independent
variable are 37, 52, 18, and 23, respectively, what is the mean of
the four values of the dependent variable? A. 32.5B. 193C. 195D.
778 E. The mean cannot be determined from the given
information.
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DATA ANALYSIS 78 When there are multiple gaps and clusters,
which of the following is the best choice to give an overall
picture of a distribution? A. Mean and standard deviation B. Median
and interquartile range C. Boxplot and its five-number summary D.
Stemplot or histogram E. None of the above are really helpful in
showing gaps and clusters.
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DATA ANALYSIS 79 A study of marital status of adults in the
United States results in the following segmented bar chart:
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Which of the following is greatest? A. Number of adults in 1900
who were married. B. One half the number of adults in 1950 who were
married. C. Number of adults in 2000 who were widowed, divorced, or
never married. D. The above all are equal. E. It is impossible to
determine the answer without knowing the actual numbers of people
involved.
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DATA ANALYSIS 80 If quartiles Q1 = 50 and Q3 = 70, which of the
following must be true? I.The median is 60. II.The mean is between
50 and 70. III.The standard deviation is at most 20. A. I only B.
II only C. III only D. All are true. E. None may be true.
