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The common measures of location are quartiles and percentiles. Quartiles are special percentiles. The first quartile, Q 1 , is the same as the 25 th percentile, and the third quartile, Q 3 , is the same as the 75 th percentile. The median, M , is called both the second quartile and the 50 th percentile. To calculate quartiles and percentiles, the data must be ordered from smallest to largest.

Homework: Section 8. The physician would like to administer a survey to his patients to measure their satistaction level with his practice. A random sample of 22 patients had an average satisfaction score of 8. The sample standard deviation was 1. Complete parts a and b below a.

The relative frequency shows the proportion of data points that have each value. The frequency tells the number of data points that have each value. Find the midpoint for each class.

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