Research
done at Harvard showed that regular soda drinkers may have a tendency toward
the weak and brittle bones associated with osteoporosis. The researchers surveyed
2622 women who were active athletes in college and classified them as to whether
or not they regularly drank soda. The proportion of women in each group who
suffered from bone fractures was determined. It was found that those who drank
soda regularly were twice as likely to suffer from bone fractures than those
who did not drink regularly.
Let's Do It! 3.2 - Food Myths
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Is this an observational study or an experiment?
What is the population under study?
What was the explanatory variable?
What was the response variable?
Suppose the 2622 women were selected as follows: From
a list of all women sports events available at Harvard, three events were selected
at random. The all women athletes who participated in these three events were
contacted for the study. What type of sampling technique is illustrated here?