Identify which of these types of sampling is used: random, systematic, convenience, stratified, or cluster.

To determine her mood, Britney divides up her day into three parts: morning, afternoon, and evening. She then measures her mood at 2 randomly selected times during each part of the day.

What type of sampling is used?

a. Random
b. Systematic
c. Stratified
d. Cluster
e. Convenience

The sampling used by Britney is stratified sampling.

Step-by-step explanation:

The type of sampling used is stratified sampling.

In stratified sampling the population is divided into groups by the researcher.

Stratified sampling has the advantage that the researcher can reduce or the sample size to get results that meet a certain precision or increase the sample size to get results that  are more accurate.

In the given case the the day is first divided into three parts: morning, afternoon and evening.

Then in each part is again divided into two randomly selected times during each part of the day in which she measures her mood.