Tensile strength tests were carried out on two different grades of wire rod resulting in the accompanying data: Grade Sample Size Sample Mean (kg/mm2) Sample Standard Deviation 1064 31 108 1.3 1078 31 124 1.6 Estimate the difference between true average strengths for the two grades with a 95% confidence interval for the previous problem. Group of answer choices (-16.352, -15.648) (-16.607, -15.393) (-16.952, -15.048) (-16.741, -15.260)

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