You will need to know the total number of students in the class N and the

# You will need to know the total number of students in

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You will need to know the total number of students in the class (N) and the number of seniors (f). 100 N f (%) Percentage
Percentages and Proportions Proportions standardize raw data to a base of 1.00. Proportions are easier to read and comprehend than frequencies. Proportions range from 0 to 1.00. Proportions are also useful ways to compare groups of different sizes, either in terms of their similarities or their differences. N f oportion Pr
Percentages and Proportions Proportions Example: Calculate the proportion of students in your statistics class that have a part-time job. You will need to know the total number of students in the class (N) and the number of students with part-time jobs (f). N f oportion Pr
Percentages and Proportions Other points to keep in mind: Percentages are usually preferred because they tend to be easier for most people to comprehend. Proportions are used less frequently, except when we are dealing with probabilities (later in Chapter 5). When the number of cases is small (less than 20), it is usually preferred to report the frequencies than percentages or proportions. Always report the number of observations along with the percentages or proportions; this gives the reader all the information needed to judge the statistic properly.
Ratios, Rates, and Percentage Change Ratios are useful for comparing the relative size of two different categories or groups.

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• Summer '17
• Wimpy
• Ratio, Elementary arithmetic, percentage change

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