A group of students around the U.S. decides to measure the length of the day (the time between sunrise and sunset) in different cities to see if the days are longer in some cities than others. For the data to be most useful, which of the following should the students be sure to do?

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A group of students around the U.S. decides to measure the length of the day (the time between sunrise and sunset) in different cities to see if the days are longer in some cities than others. For the data to be most useful, which of the following should the students be sure to do?