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The intervals must be of EQUAL SIZE.

That is, if I have a data set of numbers ranging from 1 to 20, I might create 4 intervals of 5 each, because 20 divides by 5 evenly. So I would get a table:

---------------------------------------------

| Interval | Tally | Frequency |

---------------------------------------------

| 1-5 | | |

| | | |

| 6-10 | | |

| | | |

| 10-15 | | |

| | | |

| 15-20 | | |

---------------------------------------------

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Q: When creating a frequency table the intevals must be what?
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