The type of sampling mentioned in the paragraph, where people of both genders are chosen, is called stratified sampling.
Stratified Sampling.
This type of sampling is based on separating the population into different categories or strata, after which random samples are taken from said categories, which at the end are carried out the appropriate statistical analysis regarding the variables that are sought.
In the aforementioned case, the person in charge of the analysis separates his class into two strata or categories: male and female, after which he selects members of said population at random (5 girls and 7 boys) to proceed with the statistical analysis.
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