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Comm215 MT Solutions
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1
2. Numerical Descriptive Techniques
Problems
Q1.
Solution: a
Arithmetic mean:
n
i
i
X
n
X
1
1
S
D
=
n
i
i
n
i
i
X
X
n
n
X
X
1
1
)
(
1
)
(
=
]
1
1
[
1
X
n
n
X
n
n
n
i
i
=
0
]
[
X
X
n
Q2.
Solution: c
Think of Normal distribution as an example.
Q3.
a)
Solution: quantitative data, best depicted in a histogram
b)
Solution: qualitative data, best depicted in pie graph
c)
Solution: qualitative data, best depicted in bar graph
d)
Solution: quantitative, best depicted in scatterplot

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