Two processes for manufacturing 60-watt light bulbs are under study. In both cases, the life (in hours) of the bulb before it burns out is being examined. A random sample of 21 light bulbs manufactured using the old process showed the sample variance of lifetimes to be s2 = 53.61. Another random sample of 21 light bulbs manufactured using the new process showed the sample variance of the lifetimes to be s2 = 135.94. Use a 5% level of significance to test the claim that the population variance of lifetimes for the new manufacturing process is larger than that of the old process.   (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.