To determine her blood pressure, samantha divides up her day into three parts: morning, afternoon, and evening. she then measures her blood pressure at 2 randomly selected times during each part of the day. what type of sampling is used

Answer;

-Stratified sampling

Explanation;

-A Stratified Sample  is sample in which the population is divided into mutually exclusive groups, or strata and randomly drawn from each of these groups.

-With stratified sampling, the researcher divides the population into separate groups, called strata. Then, a probability sample (often a simple random sample ) is drawn from each group.

-Using stratified sampling, it may be possible to reduce the sample size required to achieve a given precision. Or it may be possible to increase the precision with the same sample size.

which

what is a measurement of the earth’s history divided into time periods?

> fossil record <

sedimentary rock

> geologic time scale <

radioactive elements