(a)calculate (using a calculator) a 90% confidence interval for the coefficient of X (i.e.2 ) in the model. In performing this calculation, use the relevant estimated standard error of the estimator of the coefficient of X given in your summary Excel regression output. Give an interpretation of the confidence interval you calculate.

(bAgain with reference to your estimated equation, perform a test of the null hypothesis that the coefficient of number of hours of preliminary training provided to a telemarketer ( 2 ) equals zero against the alternative that it is greater than zero, using the = 0.05 (i.e. 5%) level of significance. In presenting your answer to this question you are required to use the 6-step hypothesis testing procedure given in the unit summary lecture notes. Again in answering this question, you should use the relevant estimated standard error of the estimator of the coefficient of X given in your summary Excel regression output.

(c)Give an interpretation of the realized coefficient of determination value ( r 2 ) given in your summary Excel regression output.