1f We fit a model using the qualitative variable X2 YBoB1X4B

1f) We fit a model using the qualitative variable X2; Y=Bo+B1X4+B3X2*X4+e and got following SAS output. Test if 2 lines are parallel. State hypothesis, test statistics, Degree of Freedom and conclusion.

Variable

DF

Estimate

Error

Intercept

1

-180.74431

83.75117

X4

1

199.86642

19.41391

X2

1

299.31929

251.53676

X2,4

1

-70.75408

58.54282

Solution