A candy manufacturer is testing new brands of sugar and needs to assign 150 recipes to two treatment groups. A table of random digits will be used to generate the sample. Select the appropriate way to number the experimental units.

Number all 150 recipes with labels that have the same number of digits, so each recipe can be selected fairly from a random digit table. The labels 000–149 give 150 distinct three-digit numbers. Labels 1–150 have different numbers of digits, which can make the digit-reading procedure less consistent; 01–75 and 1–2 do not label all 150 recipes.

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