For the family lung function data set, define a new variable VALLEY (residence in San Gabriel or San Fernando Valley) to be one if the family lives in Burbank or Glendora and zero otherwise. Using...

For the family lung function data set, define a new variable VALLEY (residence in San Gabriel or San Fernando Valley) to be one if the family lives in Burbank or Glendora and zero otherwise. Using variable selection techniques, perform a logistic regression of VALLEY on mother’s age and FEV1, father’s age and FEV1, and number of children (1, 2, or 3). Are these useful predictor variables?