Question: please no Excel solution 9. A supplier received results on the hardness of metal from two different hardening process (1) salt- water quenching and (2)

please no Excel solution please no Excel solution 9. A supplier received

9. A supplier received results on the hardness of metal from two different hardening process (1) salt- water quenching and (2) oil quenching. The results are shown in the following table: Salt Quench Oil Quench 152 150 150 147 145 153 148 155 141 140 152 146 146 158 154 152 139 151 148 143 a. Construct a 95% confidence interval on the difference in mean hardness. (10 points) b. What can you conclude about hardening processes? (5 points)

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