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Sampling and Research Goals
Sampling Strategies
Problems
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worked it.
1. A health educator wants to estimate proportion of women who
breast feed their babies. The population has the following
properties.
Age
Breast feed Under 20 Greater than 20
No 80,000 240,000
Yes 20,000 160,000
Total 100,000 400,000
a. What proportion of each group breast feeds?
b. What proportion of the entire population of child bearing
women breast feeds.
c. Draw a 1% simple random sample with no sampling
error.
d. Draw a stratified random sample with no sampling error with
1000 women in each age stratum.
e. If you ignore the sampling proportions, what will the
estimated proportion of breast feeding women be?
f. What will the estimate be if the estimates are weighted
according to the strata sizes?
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Answer
2. We are going to select a cluster sample. The clusters will
be drawn from a region that has a great deal of variability in
SES, but each neighborhood is homogeneous with respect to
SES.
a. If we draw a random sample of clusters, are they likely to be
homogeneous?
b. What would you do differently?
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