Data set huron gives the water level of Lake Huron in feet from 1875 to 1972. a. Plot the data and comment on its features. b. Fit a linear regression and compare this to a piecewise linear trend...

Data set huron gives the water level of Lake Huron in feet from 1875 to 1972.

a. Plot the data and comment on its features.

b. Fit a linear regression and compare this to a piecewise linear trend model with a knot at 1915.

c. Generate forecasts from these two models for the period up to 1980 and comment on these.