A histogram displays the distribution of measured data on a graph
through the use of vertical bars.
This particular histogram examines data from patients in British
Columbia diagnosed with either benign disease or malignant tumors between 1987
and 1996. The variable on the
x-axis is age at diagnosis, while the variable on the y-axis is the number of
cases for the corresponding age.
The histogram shows us that the most cases occurred in patients between
the ages of 65 and 70. We can also
see that the number of cases increases steadily from the age of 15 to 70, after
which the number decreases steadily until it reaches a low at age 90. However, one must also consider that
there probably were not as many 90-year old patients as there were younger patients.
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