data. Is there sufficient evidence to support the inclusion of the quadratic ter

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data. Is there sufficient evidence to support the inclusion of the quadratic term in the model? Explain. Test the null hypothesis that beta2 = 0 against the alternative hypothesis that beta2 0. Use alpha = 0.01. Does the quadratic term make an important contribution to the model? Your conclusion in part (c) should have been to drop the quadratic term from the model. Do so, and fit the "reduced model" y = beta o + beta X + epsilon to the data. Define beta 1, in the context of this exercise. Find a 90% confidence interval for beta1, in the reduced model of part (d). A researcher wanted to investigate the effects of several factors on production-line supervisors' attitudes toward handicapped workers. A study was conducted involving 40 randomly selected supervisors. The response Y, a supervisor's attitude toward handicapped workers, was measured with a standardized attitude scale. Independent variables used in the study were x2 = number of years of experiences in a supervisory job x1={ 1 if the supervisor is female 0 if the supervisor is male 0 if the supervisor is male

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