Question

the owner of a community pools wants to ask patrons whether they think the water should be colder. patrons are divided into four age groups, and a sample is randomly surveyed from each age group. identify the type of sample: stratified sample, convenience sample, cluster sample, systemic sample, self - selected sample

Explanation:

Stratified sampling divides the population into subgroups (strata) based on characteristics (here age - groups) and then samples from each subgroup. This is exactly what is being done as patrons are divided into age - groups and a sample is taken from each group.

Answer:

Stratified Sample