Speeding the mail? Is the number of days a letter takes to reach another city affected by

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Speeding the mail? Is the number of days a letter takes to reach another city affected by the time of day it is mailed and whether the standard 5-digit zip code or the more informative 9-digit zip code is used? Describe briefly the design of an experiment with two explanatory variables to investigate this question.

Be sure to specify the treatments exactly and to tell how you will handle lurking variables such as the day of the week on which the letter is mailed.

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