Suppose that we are randomly selecting apartments from a large building complex for a safety study. We only want to chose 4 apartments out of 100 for the first round of the study. Assume the apartments are each provided identification numbers from 1 to 100 and organized in order on a list. The building manager used a random number software to select the first room. Then every 25th room number after that on the list was also included (assume that if they reached the end of the list, they would go back to the beginning) in the study until there were 4 total rooms.

a) Identify the sampling method used in this situation. Explain how you know this isn't another method.

b) Explain why selecting the first room at random is important to this method.

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