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