What is the estimated value of the common variance

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Reference no: EM131408180

Four different brands of brake shoes have been installed on 12 city transit buses, with each brand installed on 3 buses selected at random from the 12. The number of thousands of miles before the lining required replacement was as follows for each bus.

Brand of Brake Lining
1	2	3	4
23	19	23	17
20	11	25	13
17	16	30	19

a. From the variation between the samples, what is the estimated value of the common variance, σ², that is assumed to be shared by the four populations?

b. From the variation within the samples, what is the estimated value of the common variance, σ², that is assumed to be shared by the four populations?

c. At the 0.01 level of significance, could the four types of brake linings be equally durable?

Reference no: EM131408180

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