A study to characterize the physical behavior of steelconcre

A study to characterize the physical behavior of steelconcrete beams under periodic load was carried out at the National Institute of Standards and Technology. The response variable is deflection (from rest point) of the steel concrete beam. The variance should he less than 70. A sample of fifteen beams gave the following summary statistics: Estimate the variance with a 95% confidence interval. Perform a hypothesis test that tests the alternative hypothesis that the variance is less than 70. He sure to include the hypotheses, calculation of the test statistic, calculation of the p-value, and statement of conclusion.

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