Two processes for manufacturing large roller bearings are under study. In both cases, the diameters (in centimeters) are being examined. A random sample of 21 roller bearings from the old manufacturing process showed the sample variance of diameters to be  s2 = 0.233.  Another random sample of 27 roller bearings from the new manufacturing process showed the sample variance of their diameters to be  s2 = 0.126.  Use a 5% level of significance to test the claim that there is a difference (either way) in the population variances between the old and new manufacturing processes.   (i) Give the value of the level of significance. (ii) Find the sample test statistic. (Round your answer to two decimal places.)

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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.