Daniela Sorokko
ILRST 212
9/7/06
HW # 2
Chapter 4
Thinking about Shape
a)
I think the distribution would be unimodal and skewed because most students
probably don’t have too many traffic tickets either because no one likes to receive and
pay tickets or because they may not have cars on campus. But, there’s probably a fraction
of students who receive a larger amount of tickets, thus skewing the distribution.
b) The distribution will probably be unimodal and skewed to the right because most
players at that level will have roughly equal games but a few not be playing their best
game and may diverge from the mean.
c)
The distribution of weights of female babies in a particular hospital will most likely be
symmetric and unimodal because most babies will be born at roughly equal weights, with
some slightly more or less than the mean.
d) The distribution will most likely be bimodal and skewed to the right because boys tend
to have short hair but the average length of girls’ hair is longer and the length of hair can
be unlimited in the positive direction.
Singers
a) The distribution is bimodal because there’s two humps and more or less symmetrical.
b) The reason for the bimodal distribution may be that the chorus consists of both men
and women, and since men tend to be taller on average than women, there are two modes.
Hurricanes (15)
b) The distribution is unimodal and skewed to the right. The center is around 2
hurricanes. There don’t seem to be any outliers. And the data ranges between 0 and 7
hurricanes.
Hurricanes (16)
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View Full DocumentThe distribution in the years between 1944 and 1979 is similar to the distribution in the
previous problem. It is unimodal and skewed to the right, with the center around 2 and
the data ranging between 0 and 7.
The values of 5 and 6 may be outliers in this
distribution, however, because they occur far from the center and are very infrequent. The
distribution for the hurricanes between 1970 and 2000 also have a unimodal distribution
that is skewed to the right but the center is around 1 and the data ranges between 0 and 6.
Acid Rain
The distribution seems to be unimodal and skewed to the right, with a center around 4.4
Chapter 5
Sick Days
The data that both the company and the union negotiator are using is most likely skewed
because the median and mean are very far from each other. The company may be using
the mean to calculate the average number of sick days missed, thereby taking every value
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 Fall '06
 VELLEMANP
 Standard Deviation

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