Megan Lawless
Section 3
CASE 1
1.
In ticks.1, 4 ticks carry the disease. That’s 4/20 or 20% of the ticks. It is unlikely that a
sample of only 20 ticks would have the same frequency of the disease as the entire
population of 10000 ticks.
The shape of this histogram is not well defined, since the range of values is so small. It is
somewhat skewed to the left. The mean would seem to be between 0.1 and 0.15. This
indicates that, when a sample of 20 ticks is taken, there are usually between 10% and
15% carrying the disease, although the values range from 0 to 20%.
2.
3.
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View Full DocumentMegan Lawless
Section 3
4.
The shape of the graph becomes more symmetric as larger samples are used. The
mean becomes easier to see with more samples. The range of values decreases as the
number of samples taken increases. We began with values ranging from 0 to 20%, but the
last graph had a range of 8% to 12% of ticks carrying the disease. The level of tick
infestation in the entire population is probably well represented by the graph created
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 Fall '08
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 Megan Lawless

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