Use the least squares method to fit a simple linear model that relates the annual passenger ridership (in '00,000) to the distance covered by the public transit system network. In your analysis, state what your model is, and determine whether the independent variable is signicant or not at an alevel of signicance = 5%. a. How effective is the independent variable in predicting the movement of the dependent variable? b. Calculate a 90% condence interval estimate for the true regression slope. c. Based on your model, what is the estimated number of public transit users if the transit system network cove rs a distance of 100km? d. Calculate a 95% prediction interval for your estimate in part (c)