HW1 Answer Key
8-2.
The number of observation
n
= 64
The number of intervals
8
n
=
=
Starting point = 32.0,
Ending point = 38.0
The width of each interval is (38-32)/8 = 0.75
Class Interval
Frequency
32 =
x
< 32.75
4
32.75 =
x
< 33.5
5
33.5 =
x
< 34.25
14
34.25 =
x
< 35
16
35 =
x
< 35.75
12
35.75 =
x
< 36.5
4
36.5 =
x
< 37.25
5
37.25 =
x
< 38
4
37.625
36.875
36.125
35.375
34.625
33.875
33.125
32.375
15
10
5
0
C1
Frequency
4
5
4
12
16
14
5
4
8-2 Histogram
Properties of the data:
Shape: Unimodal (perhaps bimodal if you identify a secondary mode at ~37)
Approximately Symmetric (This depends on how you define your intervals.
Different selections can lead to graphs with different shape.)
Location: ~34
Spread: ~6

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