This exercise requires the use of a computer package. The article "Movement and Habitat Use by Lake Whitefish During Spawning in a Boreal Lake: Integrating Acoustic Telemetry and Geographic Information Systems" (Transactions of the American Fisheries Society [1999]: 939-952) included the accompanying data on 17 fish caught in 2 consecutive years.
a. Fit a multiple regression model to describe the relationship between weight and the predictors length and age.
b. Carry out the model utility test to determine whether at least one of the predictors length and age are useful for predicting weight.