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2-4 example4

# 2-4 example4 - Student Grady Simonton Course Matl1119...

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Unformatted text preview: Student: Grady Simonton Course: Matl1119: Elementaiy Statistics - Spring 2010 - CRN: 49239 Instructor: Shawn Parvini - 16 weeks Date: 2118110 Book: T1‘iola: Elementaiy Statistics, 11e Time: 11:10 AM The data represents the heights of eruptions by a geyser. 123 90 123 150 12? 120 100 130 Use the heights to construct an ogive. For the horizontal axis, use these class boundaries: 1 10 129 132 ”7 89.5, 99.5, 109.5, 119.5, 129.5, 139.5, 149.5, 159.5. How many eruptions were below 120 it? 119 130 110 120 130 140 100 149 An ogive is a line graph that depicts cumulative frequencies. Note that the ogive uses class boundaries along the horizontal scale. The graph begins with the lower boundary of the ﬁrst class and ends with the upper boundary of the last class. First create a frequency distribution with the given class intervals. Class Intervals 90-99 100-109110-119120-129130-139140-149 150-159 Frequency 1 2 4 6 4 2 1 Now ﬁnd the cumulative frequencies. Class Intervals 90-99 100-109 110-119 120- 129 130-139 140-149 150-159 Class Boundaries 89.5 99.5 109.5 119.5 129.5 139.5 149.5 159.5 Cumulative Frequency 0 1 3 7 1 3 17 1 9 20 Use the cumulative frequencies to construct the ogive. 201‘ BE 4—: 0: 90 100110120130140150‘160 Ogives are useful for determining the number of values below 20} some particular value. Look at the ogive. Find the y-value that 2 corresponds to the x-value of 1 19.5. Notice that there were 7 16—: eruptions below 120 ft. 12: BE 4—: 0: 90 100110120130140150‘160 Page 1 ...
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