Supplementary Exercises 3.77 and 3.79 of IPS7e
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3.77
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Out of 663 registered voters, 72% said they had voted in the election.
The number (72%) is a statistic, computed as the total number among
those questioned saying they had voted divided by 663.

Election records showed that only 56% of registered voters actually
voted. The number (56%) is a parameter, for the entire population of
registered voters.


3.79
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The mean pushes per minute for the two groups of subjects (283 for
placebo and 311 for caffeine) are both statistics, computed from all the
measurements taken on the experimental subjects in the two groups.