What Class interval is
Class interval is a range of values that is used to group data in a frequency distribution. It is used to group continuous data into discrete categories so that it can be more easily analyzed.
Steps for Class Interval:
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Determine the range of the data: First, you need to determine the range of your data by finding the highest and lowest values.
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Determine the number of class intervals: Decide how many class intervals you want to have in your frequency distribution.
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Calculate the width of the class interval: Divide the range by the number of class intervals to determine the width of the class interval.
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Create the class boundaries: Add and subtract half of the class width from the lowest value and highest value in the data set to create the class boundaries.
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Assign the data points to classes: Assign each data point to a particular class based on its value.
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Compute the frequency of each class: Count the number of data points in each class and record it.
Examples
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Class interval can be used in a histogram to group data into ranges, such as age groups (0-10, 11-20, 21-30, etc.).
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Class interval can be used to calculate the mean and median of a data set by using the midpoints of the intervals.
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Class interval can be used to calculate the frequency of data points that fall into each of the intervals.