A political scientist divides the voting public into three groups: Republican, Democrat, and independent, and randomly selects from each group to form a sample. What is this sampling method called? simple random sampling

stratified sampling

systematic sampling

cluster sampling

what do you mean

Step-by-s tep explanation:

d. bc = 12 and ef = 16

step-by-step explanation:

we are given that δabc : δdef such that .

also, it is given that

so, from the options, we need that .

a.

b.

c.  

d.

as, we can see that only option d gives the same ratio as i.e. .

hence, the possible lengths are bc = 12 and ef = 16.

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