CentralReach (CR) Institute Practice Exam

What is the formula to calculate rate?

Number of responses / total opportunities Number of responses / total observation time Duration / responses Total observation time / number of responses

Correct Answer:

Number of responses / total observation time

Explanation:

Rate is the number of responses occurring in a given amount of time. The formula uses time in the denominator: rate equals the number of responses divided by the total observation time. For example, if there are 8 responses in 2 minutes, the rate is 8 divided by 2, which is 4 responses per minute. The other ideas mix in either opportunities or duration per response, which describe different measures: responses per opportunity reflect a probability of responding per chance, and duration per response describes how long each response takes on average. Time per response (the reciprocal of rate) isn’t rate itself.

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