Solved by verified expert :51) The modal score is:
A) 16
B) 17
C) 18
D) 20
52) The standard deviation of the scores
is:
A) 0.304
B) 1.333
C) 1.744
D) 1.838
53) The range of the scores is:
A) 4
B) 6
C) 8
D) 9
54) Which of the following is used as a
divisor in the sample variances2, where n is the sample size?
A) n+
1
B) n
C) n-
1
D) n-
2
55) Which of the following represents a
disadvantage of using the sample range to measure spread or dispersion?
A) It produces spreads that are too large.
B) The sample range is not measured in the
same units as the data.
C) The largest or smallest observation (or
both) may be an outlier.
D) None of the above is correct.
56) The correlation coefficient of the
following sample data of four (X, Y) pairs: (1, 5), (2, 10), (4,
7), and (5, 9) equals:
A) 0.263
B) 0.412
C) 0.528
D) 0.364
57) The following ten scores were obtained
on a 20-point quiz: 4, 5, 8, 9, 11, 13, 15, 18, 18, and 20. The teacher
computed the usual descriptive measures of center (central tendency) and
variability (dispersion) for these data, and then discovered an error was made.
One of the 18s should have been a 16. Which of the following measures,
calculated on the corrected data, would change from the original computation?
A) median
B) arithmetic mean
C) range
D) geometric mean
58) A college placement office conducted a
survey of 100 engineers who had graduated from Stanford University. For these
engineers, the mean salary was computed to be $72,000 with a standard deviation
of $8,000. The percentage of these engineers who earn more than $96,000 or less
than $48,000 is:
A) approximately 0%.
B) at least 5.6% (1/18 of the engineers).
C) at most 5.6% (1/18 of the engineers).
D) at most 11.1% (1/9 of the engineers).
59) For which measure of central location
will the sum of the deviations of each data value from that measure always be
zero?
A) arithmetic mean
B) geometric mean
C) median
D) mode
60) Which one of the values below
represents a lower quartile for the data set 23, 24, 21, and 20?
A) 22.0
B) 22.5
C) 20.25
D) 23.5
