To determine her blood sugar level, Keri divides up her day into three parts: morning, afternoon, and evening. She then measures her blood sugar level at 4 randomly selected times during each part of the day.
What type of sampling is used?

Stratified

Explanation:

The stratified sampling can be defined as the sampling from the population which is partitioned or divided into many parts.

Here, the lady has divided her day into three parts morning, afternoon and evening.

This is a way which is used to take sample randomly from the population. therefore, Keri took 4 random sample from each part of the day.

This is a type of stratified sampling.