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Chapter 2 (Sp11) - Section 2.1 Organizing Qualitative Data...

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Section 2.1 – Organizing Qualitative Data Frequency Distribution (frequency table) – A list of data values (grouped into classes/categories) along with their corresponding frequencies. Example : A phlebotomist draws the blood of a random sample of 50 patients and determines their blood types as shown below. Create a frequency distribution for the blood types. O O A A O B O B A O AB B A B AB O O A A O AB O A B A O A A O A O A O AB A O B A A O O O O A O O A O A O Relative Frequency = the proportion (or percent) of observations within a category. Relative Frequency = s frequencie all of sum frequency class Example : Create a relative frequency distribution for the last example Blood Type Frequency Blood Type Relative Frequency 1
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Bar Graph Constructed by labeling each category of data on the x -axis and the frequency (or relative frequency) on the y -axis. Rectangles of equal width are drawn for each category and the height of the rectangle represents the frequency. Bars do not touch. Example : Draw a frequency bar graph for the last example.
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