# 3900Chp3 - Chapter 3 A Statistics Refresher What are Scales...

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What are Scales of Measurement? Nominal Categories Ordinal Magnitude Interval Magnitude and equal interval Ratio All others and has a true zero point Examples Groups of low, medium, high? How much you like something? 1 not at all 5 very much Frequency Distribution Summary information of scores and their occurrence. Grouped Frequency Distribution Intervals replace specific values Identification of 12-15 class intervals recommended Example of G.F.D. 20 students surveyed. Values are the number of alcoholic beverages. How do you create a frequency distribution using six classes? Steps Step 1: Find the highest and lowest values: H = 9 and L = 0. Step 2: Find the range: R = H – L = 9 – 0 = 9. Step 3: Select the number of classes desired. In this case: 6. Step 4: Find the class width by dividing the range by the number of classes. Width = 9/6 = 1.5. Value is rounded up. Step 5: Select a starting point for the lowest class limit: 0, 2, 4, 6, 8, 10. Step 6:

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3900Chp3 - Chapter 3 A Statistics Refresher What are Scales...

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