What are class intervals in a grouped frequency distribution, and how do you choose appropriate class intervals for continuous data?
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Class intervals are ranges used to group data in a frequency table. To choose appropriate class intervals for continuous data, first find the range (subtract the smallest value from the largest), decide how many intervals you need (usually between 5 and 20), calculate the class width (range ÷ number of intervals), and create the intervals starting from the smallest value.