Question

. The p-value of the subset F-test for comparing th models for unsuccessful cabin crews was reported in the article as p < .10. Formally test the null hypothesis using a05. What do you conclude? 12.101 Buy-side vs. sell-side analysts' earnings forecasts. Refer to the Financial Analysts Journal (July/August 2008) comparison of earnings forecasts of buy-side and sell-side analysts, Exercise 12.90 (p. 741). Recall that the profes sors used regression to model the relative optimism (y of the analysts' 3-month horizon forecasts as a function of x1 (1 if the analyst worked for a buy-side firm, 0 if the analyst worked for a sell-side firm] and x2number of days between forecast and fiscal year-end (i.e., forecast horizon). Consider the complete second-order model a. What null hypothesis would you test to deter- mine whether the quadratic terms in the model are statistically useful for predicting relative optimism (y)? b. Give the complete and reduced models for conducting De the test, part a c. What null hypothesis would you test to determine whether the interaction terms in the model are re com statistically useful for predicting relative optimism (y)? d. Give the complete and reduced models for conducting the for am ale. the test, part c. e. What null hypothesis would you test whether the dummy variable terms in the rmotimismt statistically useful for predicting relative optin goal (y)? bles f. Give the complete and red uced models for conduct head the test, part e. er of to t 12.102 Workplace bullying and intention to leave. Refer urser Human Resource Management Journal (October 41) study of workplace bullying, Exercise 12.91( (p. 74 as a all that multiple regression was us to model an

Answer 1

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<d) The Complete medel is The educed mode ! esis or determine the dumm ^larlable erms n uthe model ae used 0pAmigm in ulte Qrd trate, model is Complete rel 3 e ^edued odel is