Question

Claudia is interested in knowing which figure skater competing in the

Olympic Games is most favored to win a gold medal. To sample the
students in her school, she prepares a list of all of the boys and girls in the
school and randomly chooses a sample from each group so that the size of
each group is proportional to the number of boys and girls in the school.
Which sampling method did Claudia use?
OA) simple random sampling
OB) stratified random sampling
OC) systematic random sampling
OD) simple non-random sampling

Answer 1

OD) Is simple non-randon sampling

Explanation:

because Claudia randomly choose a sample from each group.

Answer 2

Claudia used Stratified Random Sampling (OB).

In stratified random sampling, the population is divided into subgroups (strata) based on a certain characteristic, and a random sample is taken from each stratum. In Claudia's case, she divided the population into two subgroups based on gender (boys and girls), and took a random sample from each group proportional to the number of boys and girls in the school. This method is used when the researcher wants to ensure that the sample is representative of different subgroups in the population.