The failure strengths of a random sample of concrete specimens were found equal to (in ksi): 3.5, 3.7, 3.3, 3.2, 3.4, 3.3, 3.6, 3.3, 3.4. 1. Construct a 90% confidence interval estimate of the average failure strength of the concrete specimens. 2. construct a 90% confidence interval of the variance of the failure strength of the concrete specimens. What assumptions are necessary for your answers to be valid?

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The failure strengths of a random sample of concrete specimens were found equal to (in ksi): 3.5,
3.7, 3.3, 3.2, 3.4, 3.3, 3.6, 3.3, 3.4.
1. Construct a 90% confidence interval estimate of the average failure strength of the
concrete specimens.
2. construct a 90% confidence interval of the variance of the failure strength of the concrete
specimens. What assumptions are necessary for your answers to be valid?
Transcribed Image Text:The failure strengths of a random sample of concrete specimens were found equal to (in ksi): 3.5, 3.7, 3.3, 3.2, 3.4, 3.3, 3.6, 3.3, 3.4. 1. Construct a 90% confidence interval estimate of the average failure strength of the concrete specimens. 2. construct a 90% confidence interval of the variance of the failure strength of the concrete specimens. What assumptions are necessary for your answers to be valid?
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