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Question: Blood pressure. A company held a blood pressure screening clinic for its employees. The results are summarized in the table below by age group and blood pressure level:
a) Find the marginal distribution of blood pressure level.
b) Find the conditional distribution of blood pressure level within each age group.
c) Compare these distributions with a segmented bar graph.
d) Write a brief description of the association between age and blood pressure among these employees.
e) Does this prove that people's blood pressure increases as they age? Explain.
Could this information be viewed as representing the nominal scale of measurement? If so, explain your reasoning. If not, why not?
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Getting data and making calculations can be the easy part. Understanding the real issues and asking the right questions can be more difficult. Reporting average travel time or the variability in competitors' price can be a computational exercise.
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