An industrial engineer is analyzing the structural strength of a concrete aggregate. Structural strength is normally distributed with o? = 1000 (psi). A random sample of 12 specimens has a mean strength of = 3250 psi. Compare the width of the 95% confidence interval with the width of 99% confidence interval. Which has higher precision of estimation on the unknown µ? Include your solutions. a. NONE b.95% confidence interval is narrower than the 99% interval. It has a higher precision of estimating the population mean c. 95% confidence interval is wider than the 99% interval. It has a higher precision of estimating the population mean O d. 3232 < u s 3268 and 3226 < u S 3274

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