You're trying to improve patient satisfaction scores in your hospital's emergency department. You decide to poll 40 patients a day for three weeks. Your charge nurse says that the quality of service really fluctuates depending on the time of day. So your daily sample consists of 10 patients polled at 8 AM, another 10 at noon, another 10 at 5 PM, and the final 10 at 9 PM. This is an example of what kind of sampling?

Stratified random sampling

Explanation:This is a method of sampling from a large number of individuals into small number of individuals in order to achieve effective results. It is mostly used by statisticians. Below is a diagram to show how stratified sampling is divided into four groups in order to improve patients satisfaction scores in an hospital.

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