The tensile strength of a fibre used in manufacturing garments is of interest to the purchaser....

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The tensile strength of a fibre used in manufacturing garments is of interest to the purchaser. Eight fibre specimens were randomly selected, with an average tensile strength of 127psi and a standard error of 0.5psi. (i) At a 98% level of confidence, does the average tensile strength of the fibre surpasses 130psi? [15] (ii) Compute and interpret the power of your test in (i). (5] (iii) Estimate and interpret a 98% confidence interval for the average tensile strength of the fibre. [9] The tensile strength of a fibre used in manufacturing garments is of interest to the purchaser. Eight fibre specimens were randomly selected, with an average tensile strength of 127psi and a standard error of 0.5psi. (i) At a 98% level of confidence, does the average tensile strength of the fibre surpasses 130psi? [15] (ii) Compute and interpret the power of your test in (i). (5] (iii) Estimate and interpret a 98% confidence interval for the average tensile strength of the fibre. [9]