Stats 48 notes page 3

Stats 48 notes page 3 - limit of each class. Cumulative...

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controlled so that more informative data can be obtained about the variable of interest. cross-sectional data - data collected at the same or approximately the same point in time, for example, data detailing the number of building permits issued in june 2010 in each of the counties of California. Time series data - data collected over several time periods. Graphs of time series data are frequently found in business publications. Such graphs help analysts understand what happened in the past, identify any trends over time, and project future proportions as percentages Cumulative Distributions Cumulative frequency distribution -uses the number of classes, class widths, and class limits developed for the frequency distribution. However, rather than showing the frequency of each class, the cumulative frequency distribution shows the number of data items with values less than or equal to the upper class
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Unformatted text preview: limit of each class. Cumulative relative frequency distribution-shows the proportion of data items with values less than or equal to the upper limit of each class. Cumulative percent frequency distribution-shows the percentage of data items with values less than or equal to the upper limit of each class. Note : The last entry in a cumulative frequency distribution always equals the total number of observations (sample size), the last entry in a cumulative relative frequency distribution always equals 1, and the last entry in a cumulative percent frequency distribution always equals 100. Ogive- a graph of a cumulative distribution which shows data values on the horizontal axis and either the cumulative frequencies, cumulative relative frequencies, or cumulative percent frequencies on the vertical axis....
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Stats 48 notes page 3 - limit of each class. Cumulative...

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