Chapter 2.ppt - Chapter 2 Descriptive Statistics Percentages Ratios Rates Tables Charts and Graphs FREQUENCY DISTRIBUTIONS LEARNING OBJECTIVES Explain

Chapter 2.ppt - Chapter 2 Descriptive Statistics...

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Chapter 2 Descriptive Statistics: Percentages. Ratios, Rates, Tables, Charts and Graphs
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FREQUENCY DISTRIBUTIONS January 28, 2015
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LEARNING OBJECTIVES Explain how frequency distributions make data understandable Construct and analyze frequency distributions Compute and interpret percentages, proportions, ratios, rates, rate ratios & percentage change, Depict data using appropriate charts Use SPSS to generate frequency distributions
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Percentages and Proportions Report relative size Compare the number of cases in a specific category to the number of cases in all categories Compare a part ( specific category ) to a whole ( all categories ) The part is the numerator ( f ) The whole is the denominator ( N)
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Percentages and Proportions What percentage of a group of people is female? The whole is the number of people in the group The part is the number of females To identify the whole and the part, use the keywords of and is of identifies the whole (N) is identifies the part (f)
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Percentages and Proportions: Formula
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MOVING BETWEEN A PERCENTAGE AND A PROPORTION You are often asked to move seamlessly between a proportion and a percentage. Always check to see what a problem is asking. If you have a percentage and need a proportion, you simply move the decimal point two places to the left. In other words, you divide by 100. If you have a proportion and need a percentage, you move the decimal two places to the left, meaning multiply by 100. See if you can download and play about in the EXCEL worksheet posted in this module. Download the file and try a few things. What is the proportion of students that are senior in this course? To figure this out you would count the number of seniors and divide by 25. There were 25 students registered as of 6/28. Once you get proportion of seniors, multiply by 100 to get the percentage of seniors. Try a few things. Go to the data tab and try sorting by the variable class. This makes it easier to count. If you screw up, just download the correct file again.
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Percentages and Proportions: Some Examples (Your homework will partially look like these examples.)
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Percentages and Proportions: Another Example-raw data
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Percentages and Proportions: Percentages for the previous raw data—What would the proportions look like?
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Percentages and Proportions: Calculation Examples—Data not shown What % of social science majors are male?
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