The breaking strengths of a random sample of 26 molded plastic housings ere measured, and a sample

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The breaking strengths of a random sample of 26 molded plastic housings ere measured, and a sample mean of x- = 479.42 and a sample standard deviation of s = 12.55 were obtained. A confidence interval (472.56. 486.28) for the average strength of molded plastic housings was constructed from these results. What is the confidence level of this confidence interval?
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