Four different insulator products made of different rubber mixtures are being tested. One of the tested features of the products is their tensile strength. Therefore, a random sample of insulator products drawn from each mixture is used to determine whether there is variability in the mean tensile strength data. Table 2 shows the measured data on tensile strength in grams per square centimetre. Rubber Mixture A B C D 16.8 16.9 19.5 14.6 21.4 16.4 18.9 20.3 20.1 17.1 18.6 16.4 21.5 20.9 20.5 17.5 19.2 15.8 18.1 18.5 Table 2 Design your analysis at the 0.025 and 0.25 significance levels from tabulated data. Compare your findings.

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Q: 4.122

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A: Given,  4/(z + 1)  =  2/(z + 7)  To find value of z.

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Q: 8. 11

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