3. Because the weights are likely to follow a normal distribution, on expects the points in a
normal quantile plot to approximate a straight line.
4. Identify outliers.
If there is more than one outlier present, reject the idea that the data come
from a normal distribution.
5. No, the data do not appear to come from a population with a normal distribution.
The points
are not reasonably close to a straight line.
6. Yes, the data appear to come from a population with a normal distribution.
The points are
reasonably close to a straight line.
7. Yes, the data appear to come from a population with a normal distribution.
The points are
reasonably close to a straight line.
8. No, the data do not appear to come from a population with a normal distribution.
The points
form a S-shaped pattern, and not a straight line.

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184
CHAPTER 6
Normal Probability Distributions
9. Yes, the data appear to come from a population with a normal distribution.
The frequency
distribution and histogram indicate that the data is approximately bell-shaped.
duration (hours)
frequency
0 –
49
1
50 –
99
8
100 – 149
18
150 – 199
23
200 – 249
25
250 – 299
19
300 – 349
11
350 – 399
8
400 – 449
2
115
10. No, the data do not appear to come from a population with a normal distribution.
The
frequency distribution and the histogram indicate the data are positively skewed.
number of flights
frequency
0
67
1
71
2
57
3
52
4
42
5
16
6
5
7
2
312
11. No, the data do not appear to come from a population with a normal distribution.
The
frequency distribution and the histogram indicate there is a concentration of data at the lower
end.
degree days
frequency
0 –
499
20
500 –
999
5
1000 – 1499
8
1500 – 1999
9
2000 – 2499
5
2500 – 2599
1
48
duration
(hours)
frequency
400
300
200
100
0
25
20
15
10
5
0
number of flights
frequency
7
6
5
4
3
2
1
0
80
70
60
50
40
30
20
10
0
degree days
frequency
3000
2500
2000
1500
1000
500
0
20
15
10
5
0
___________________________________________________________________

Assessing Normality
SECTION 6-7
185
12. Yes, the data appear to come from a population with a normal distribution.
The frequency
distribution and the histogram indicate the data is approximately bell-shaped.
volts
frequency
124.0
2
124.1
0
124.2
1
124.3
2
124.4
4
124.5
4
124.6
5
124.7
6
124.8
7
124.9
3
125.0
2
125.1
2
125.2
2
40
NOTE
: The normal quantile plots for Exercises 13-16 may be obtained
directly from many sources or constructed using Minitab for n scores
in C1 using the commands at the right, where (2n-1) and (2n) are the
actual values, and then plotting C1 on the x-axis and C4 on the y-axis.
See Exercises 19 and 20 for more detail on the mechanics of this
process, which is the five-step “manual construction” process given in
the text.
13. Yes.
Since the points approximate a
straight line, the data appear to come
from a population with a normal
distribution.
The gaps/groupings in
the durations may reflect the fact that
the times have to reflect whole
numbers of orbits or other physical
constraints.
14. No.
Since the points do not
approximate a straight line, the data
do not appear to come from a
population with a normal
distribution.