Price of Abbott Labs stock (cont’d). Refer to Exercise 14.63.

a. Fit a simple linear regression model to the stock price data.

b. Plot the fitted regression line on a scatterplot of the data.

c. Forecast the 2020 and 2021 closing prices using the regression model.

d. Construct 95% prediction intervals for the forecasts of part

c. Interpret the intervals in the context of the problem.

e. Obtain the time series residuals for the simple linear model and use the Durbin-Watson d-statistic to test for the presence of autocorrelation.