SOLUTIONS MANUAL for Statistical Methods 4th Edition by Mohr Donna, Wilson William & JFreund Rudolf. ISBN 9888, ISBN-13 978-5. TABLE OF CONTENTS: 1. Data and statistics 2. Pr obability and sampling distributions 3. Principles of inference 4. Inferences on a single population 5. Inferences for t...
EXERCISE 1 a) Mean = 17.00, SD = 5.53, median = 17.00,
Range = 22,
IQR = 20 – 13 = 7.
b) See boxplot.
c) A typical value for X is 17 which is both the mean and the
median. About half the values are between 13 and 20. The boxplot
shows that the upper tail is slightly longer, but difference is small
and mean and median are equal. This distribution is roughly
symmetric.
Chapter 1 – Page 1
,EXERCISE 2
Variable Mean Median Variance Standard Shape
Deviation
WATER 7.125 1.500 452.864 21.28 extremely positively
skewed
Fowl Frequency Midpoint approximate mean = 5500/52
0 ≤ x < 100 41 50.0 = 105.8
100 ≤ x < 200 6 150.0
200 ≤ x < 300 3 250.0 approximate variance = 50746
300 ≤ x < 400 1 350.0
1400 ≤ x < 1500 1 1450.0
c) Scatterplots
fowl
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
0 1 2 3 4 5 6 7 8 9
veg
Aside from the single point with extraordinary number of waterfowl, there is little relationship.
Chapter 1 – Page 3
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