F I L E A c c o rd in g to th e W o rld H e a lth O rg a n iz a tio n , o b e s ity has re a c h e d e p id e m ic p ro p o rtio n s g lo b a lly . W h ile o b e s ity has g e n e ra lly b e e n lin k e d w ith c h ro n ic d ise a se a n d d is a b ility , re sea rch e rs a rg u e th a t it m a y a lso a ffe c t w a g e s . B o d y M ass In d e x (B M I) is a w id e ly u sed w e ig h t m e a s u re th a t a lso a d ju s ts fo r h e ig h t. A p e rs o n is c o n s id e re d n o rm a l w e ig h t if BM I is b e tw e e n 18.5 to 25, o v e rw e ig h t if BM I is b e tw e e n 25 to 30, a n d o b e s e if BM I is o v e r 30. T h e a c c o m p a n y in g ta b le s h o w s a p o rtio n o f d a ta o n th e s a la ry o f 30 c o lle g e -e d u c a te d m e n w ith th e ir re s p e c tiv e B M I; th e c o m p le te d a ta , la b e le d B M I, a re a v a ila b le o n th e te x t w e b s ite .

Salary (in $1,000s) BMI 34 33 43 26 45 21

a. E s tim a te a lin e a r m o d e l w ith s a la ry as th e re sp o n se v a ria b le a n d BM I as th e e x p la n a to ry v a ria b le . W h a t is th e e s tim a te d s a la ry o f a c o lle g e -e d u c a te d m a n w it h a BM I o f 25? W ith a BM I o f 30?

b. E s tim a te an e x p o n e n tia l m o d e l u s in g lo g o f s a la ry as th e re s p o n s e v a ria b le a n d BM I as th e e x p la n a to ry v a ria b le .

W h a t is th e e s tim a te d s a la ry o f a c o lle g e -e d u c a te d m a n w ith a BM I o f 25? W ith a BM I o f 30?

c. W h ic h o f th e a b o v e t w o m o d e ls is m o re a p p ro p ria te fo r th is a p p lic a tio n ? Use R2 fo r c o m p a ris o n .