Refer to Example 1 and the data on the resiliency modulus of recycled concrete.

(a) Obtain a 95% confidence interval for the population mean resiliency modulus \(\mu\).

(b) Is the population mean contained in your interval in part (a)? Explain.

(c) What did you assume about the population in your answer to part (a)?

(d) Why are you 95% confident about the interval in part (a)?

Data From Example 1

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EXAMPLE I Types of Inference: point estimation, interval estimation, and testing hypotheses Refer to Example 14, Chapter 2, and the data on recycled concrete pavement. Green engineering practices require that their strength be accessed before using them in the base of roadways. Measurements of the resiliency modulus(MPa) on n = 18 specimens of recycled concrete aggregate produce the ordered values (Courtesy of Tuncer Edil).