6.9 In Exercise5 .15 we ex'o ressedth e model Y,: ,uYfrzT 'n ft' +'tl'e x{Pe ,}

in termso f logarithmsa nd estimatedit using datai n the file manuf.dat.U se the data and results from Exercise 5.15 to test the following hypotheses:

( a ) Ho : 9 z: 0 a g a i n sHt1 :B2 l 0 .

(b) 110:92: 0, 9: : 0 againsHt r:92*0and/orFzl0.

(c) F1oB: z : 0, B+: 0 againsHt 1:$2l0and/orBal0.

(d) H0:92: 0, F: :0, F+: 0 againsHt t :9z l0and/or B3l0and/orFc l0.

(e) Ho:92* 9r * F+* 9s : I againsHt t :92 - l -Fr+ 9q+9s *1.

(0 Analyze the impact of collinearity on this model.