A random sample of 10 observations has been drawn from a


1. A random sample of 30 observations has been drawn from a normal population, and the sample variance is found to be s2 = 23.8. Determine the 95% confidence interval for σ2.

2. A random sample of 10 observations has been drawn from a normal population, and the sample variance is found to be s2 = 19.5. Determine the 98% confidence interval for σ2.

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Basic Statistics: A random sample of 10 observations has been drawn from a
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