: It is crucial that the variance of a production process be less than or equal to 25. A sample of 22 is taken. The sample variance equalled 26.a.Construct a 90% confidence interval for the population variance.b.Construct a 90% confidence interval for the population standard deviation.c.State the null and alternative hypotheses to be tested.d.Compute the test statistic.e.The null hypothesis is to be tested at the 10% level of significance. Using the critical value approach, state the decision rule for the test.f.What do you conclude about the population variance?
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