To determine her breathing rate Miranda divides up her day i

To determine her breathing rate, Miranda divides up her day into three parts: morning, afternoon, and evening. She then measures her breathing rate at 4 randomly selected times during each part of the day. What type of sampling is used? A. Simple random B, Stratified C. Systematic D. Convenience E. Cluster

Solution

this is called stratified sampling, where , the researcher divides the population into separate groups and takes random samples from each group