351
CHAPTER 12
Section 12.1
1.
a.
Stem and Leaf display of temp:
17 0
17 23
stem = tens
17 445
leaf = ones
17 67
17
18 0000011
18 2222
18 445
18 6
18 8
180 appears to be a typical value for this data.
The distribution is reasonably symmetric
in appearance and somewhat bell-shaped.
The variation in the data is fairly small since
the range of values ( 188 – 170 = 18) is fairly small compared to the typical value of 180.
0 889
1 0000
stem = ones
1 3
leaf = tenths
1 4444
1 66
1 8889
2 11
2
2 5
2 6
2
3 00
For the ratio data, a typical value is around 1.6 and the distribution appears to be
positively skewed. The variation in the data is large since the range of the data (3.08 - .84
= 2.24) is very large compared to the typical value of 1.6.
The two largest values could
be outliers.
b.
The efficiency ratio is not uniquely determined by temperature since there are several
instances in the data of equal temperatures associated with different efficiency ratios.
For
example, the five observations with temperatures of 180 each have different efficiency
ratios.

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