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Janine intends use collect a stratified sample of 40 girls to interview. group A B C...

Janine intends use collect a stratified sample of 40 girls to interview. group A B C D TOTAL number of girls

   38 30 18 40 126

Calculate the number of girls from each group that should be in the sample?

Math   Statistics-And-Probability   
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Answer #1

In stratified random sampling, the population is divided into different groups. units are selected from each of these group with the help of simple random sampling.

In this case, there are four strata namely a, b, c, and d

the total sample size is 40 girls to be interviewed. The total number of units for all the strata are 126. This indicates that approximately 32% of the total units in all the strata should be included in the sample.

A B C D TOTAL
ni 38 30 18 40 126
32%*ni 12.16 9.6 5.76 12.8

this indicates that 12 units from group A, 9 units from group B, 6 units from Group C, and 13 units from group D should be selected. The sum to a total of 40 units in the sample

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