Question: 58. A random sample of 18 observations from a normal population produced a sample mean of 37.4 and a sample variance of 15.6. Do the

58. A random sample of 18 observations from a normal population produced a sample mean of 37.4 and a sample variance of 15.6. Do the data provide sufficient evidence to indicate that σ2 < 20? Use the 5% level of significance.

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