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STAT 1124 Section 2
Mid Term 1
February 12, 2009
Model Answers
You have 55 minutes to complete the test.
Justify your answers in order to receive full credit
The total number of points is 28
1.
Daily rainfall (in millimeters) was recorded over a 30-year period in a coastal town in
British Columbia. For each year, the day that had the greatest amount of rainfall was
identified. Therefore, in total, there are 30 data points, one for each year. The
following is a summary of this data set:
Sample Size
30
Mean
126.6
Standard Deviation
57.5
Minimum
47.5
Maximum
271.8
Median
116.3
Q1
84.6
Q3
154.4
a)
Describe the distribution of the data set. Justify your answer (
2 points
)
The distribution of the data set is skewed to the right. Please refer to the box
plot below. Also, the mean is greater than the median.
b)
Use a graphical tool to support your description in a) (
2 points
)
84.6
17.2
154.4
271.8
47.5

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