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(b) Given the information in part (a), what is the approximate 95% condence interval for the conditional mean of RETLPCT? O What is the formula?

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(b) Given the information in part (a), what is the approximate 95% condence interval for the conditional mean of RETLPCT? O What is the formula? 0 Where is information on the value for 8, given in the above table? ' What are the degrees of freedom in order to find the t value in the tables? What is the t-value? 0 What then is the answer (what is the Cl)? (C) Given the information in part (a), what is the approm'mate 95% prediction interval for RETLPCT

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