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A grouped frequency table can be used to illustrate a hypothetical distribution of simple reaction times for a sample of $$20$$ participants. Since reaction times encompass a wide range of continuous values, the first column lists ranges of equal width—specifically, intervals such as $$141$$ to $$160$$, $$161$$ to $$180$$, and up to $$241$$ to $$260$$ milliseconds. The second column displays the frequency of participants whose reaction times fall into each respective interval. For instance, the table shows that $$9$$ participants had reaction times in the $$181$$ to $$200$$ millisecond range, effectively summarizing the data into manageable groups.

Grouped Frequency Table of Reaction Times

In a grouped frequency table summarizing reaction time data for 20 participants, the first column lists ____ of equal width (e.g., 141–160 ms, 161–180 ms), while the second column displays the number of participants whose scores fall within each interval.

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