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 equaled 26. a. Construct a 90% confidence interval for the population variance.   b. Construct a 90% confidence interval for the population standard deviation.   c. Test at 10% level of significance that whether the variance of the production process exceeds its standard. (Use the critical value approach.) (You must state H0 and Ha, compute the test statistic, report the critical value, and draw conclusion.)

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.