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Question: 8 10 pieces of cable are selected at random from...

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(8) 10 pieces of cable are selected at random from a manufacturer and tested. Their breaking strength in suitable units are: 2981, 2979, 2984, 2975, 2989, 2973, 2985, 2987, 2983, 2980. (i) Calculate unbiased estimates for the mean and the variance of the breaking (ii) (iii) strength of cables made by this manufacturer. Obtain a 95% confidence interval for the mean breaking strength. Obtain a 95% confidence interval for the variance.

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