Construct a 95% confidence interval for the population mean length of engineering conferences. (i) State the confidence interval. (Round your answers to two decimal places.) (ii) Sketch the graph. (Round your answers to two decimal places. Enter your $alpha$/2 to three decimal places.) $frac{alpha}{2}$ = C.L. = $frac{alpha}{2}$ = (iii) Calculate the error bound. (Round your answer to two decimal places.)
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