Question

A pharmaceutical company interested in measuring how often
physicians prescribe a certain drug has selected a simple random
sample from each of two groups: M.D. (Medical Doctors) and D.O.
(Doctors of Osteopathic). What is this type of sampling
called?

Simple random sampling.

Stratified random sampling.

None of the above.

Answer #1

In simple random sampling, we sample our data from the entire population. Here the effects of the subpopulations in a population are not considered.

In stratified random sampling, we sample our data from the individual subpopulations(partitions of a population) of an entire population. Sampling in this way helps in determining the effect of subpopulations.

In the above problem, they had sampled from two groups of a population(M.D and D.O). Hence such type of sampling is called stratified random sampling.

Suppose that a pharmaceutical company is interested in testing
their new cholesterol medication and recruited 11 sets of identical
twins with high blood pressures. For each twin, one was given the
new drug and the other was given the old drug, then the reduction
in LDL cholesterol level (unit: mg/dL) was measured after 6 months.
Summary statistics of the amount of reduction are shown
below.
NOTE: Not all outputs given above are
useful
n
x
s
New Drug
11
42...

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How we select our sample will directly influence the
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Question 1 (1 point)
You own a small storefront retail business and are interested in
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Merck, AIDS, and Africa Written July 2001, Revised October 23,
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