A blood bank in Hillsborough county noticed that the percentages of each blood t

Question

A blood bank in Hillsborough county noticed that the percentages of each blood type from donors seemed to differ from the national averages. Wanting to be sure that they kept adequate supplies for the blood types in their community, they decided to conduct a survey. They randomly selected 100 women and 100 men from a list of all county residents who had previously indicated that they would be willing to donate blood. A nurse was sent to record the blood type of each potential donor. The information was combined to estimate the percentages of each blood type for the county.
What type of sampling plan is this?

Explanation / Answer

stratified random sampling

sampling frame here it is stratified(by sex males and females) then random sampling

n stratified random sampling, the strata are formed based on members' shared attributes or characteristics. A random sample from each stratum is taken in a number proportional to the stratum's size when compared to the population. These subsets of the strata are then pooled to form a random sample.

stratified random sampling

sampling frame here it is stratified(by sex males and females) then random sampling

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