Refer to Exercise 8.5 (data set PopulationUSA). Compute 10-year increments of the population growth x1 = 5.3 − 3.9, x2 = 7.2 − 5.3, etc.

(a) Compute sample mean, median, and variance of 10-year increments. Discuss how the U.S. population changes during a decade.

(b) Construct a time plot of 10-year increments and discuss the observed pattern.

Exercise 8.5

The following data set shows population of the United States (in million) since 1790,

Construct a time plot for the U.S. population. What kind of trend do you see? What information can be extracted from this plot?

These data are available in data set PopulationUSA

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