With reference to Exercise 7.56, construct a 95% confidence interval for the variance of the yield.

Data From Exercise 7.56

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7.65 The statistical program MINITAB will calculate t tests. With the nanopillar height data in C1, Dialog box: Stat Basic Statistics > 1-Sample t. Click on box and type C1. Click Perform hypothesis test and Type 300 in Hypothesized mean. Choose Options. Type 0.95 in Confidence level and choose not equal. Click OK. Click OK produces the output