Unformatted text preview: Student: Grady Silnonton Course: Math119: Elementary Statistics - Spring 2.010 - CRN: 49239
Instructor: Shawn Parvini - 16 weeks Date: 2/18/10 Book: Triola: Elementary Statistics, 11e
Time: 11:10 ANI The following data represent the number of people from a
town aged 25-64 who have intemet access in their homes. Construct a frequency polygon using the data.
First, find each class midpoint by adding the lower class limit and the upper class limit and dividing the result by 2.
The midpoint of the first class is found using the aforementioned formula as seen below. 34+25 = 29.5 The rest of the class midpoints, shown below, can be found by the same method. Midpoint To draw a frequency polygon, plot a point above each class midpoint on a horizontal axis at a height equal to the
frequency of the class. After the points are plotted, straight lines are drawn between consecutive points. The line segments are extended to the
leﬁ and right so that the graph begins and ends on the horizontal axis. Here is the ﬁ‘equency polygon that matches the data. 1000—
200i Frequency 29.5 39.5 49.5 59.5
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- Spring '10