LibraryPirate

ANSWERS TO ODD-NUMBERED EXERCISES A-113
GFR
90
80
70
60
50
40
30
20
10
Boxplot of GFR
17. Some examples include difference, diversity, departure, discrepancy, deviation, and
entropy
19. x = 3.95, Median = 3, s = 3.605, s 2 = 12.998
21. Answers will vary: It is not uncommon for students to score higher on exams as a
semester progresses; therefore, the exam scores are likely to be left skewed, making
the median, which is less affected by skew, to be the better choice.
23. Answers will vary: Using Sturges's rule, where w = R k , k = 1 + 3.3221log 10 300) M
9.23. An estimate of sample standard deviation can be found by dividing the sample
range by 4. Therefore, s L R so that . Using this formula, then and
w = 160
9.23 = 17.33 4
R L 4s
R = 160
suggesting that (d) or (e) may be appropriate.
25. Answers will vary: Imagine you are examining protein intake among college students.
In general most students are likely to consume the average daily protein intake,
but among this population, there is likely to be a fair number of athletes who consume
large amounts of protein owing to the demands of their sport. In that case, the data are
likely to be positively skewed, and the median better represents the central tendency of
the data.
27. Variable N Mean Median TrMean StDev SE Mean
S/R 216 0.3197 0.2440 0.2959 0.2486 0.0169
Variable Minimum Maximum Q1 Q3
S/R 0.0269 1.1600 0.1090 0.4367
IQR = .3277, Range = 1.1331, IQR>R = .2892
S/R ratio
1.2
1.0
0.8
0.6
0.4
0.2
0.0
Boxplot of S/R ratio
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