Question: A manufacturer has been having some quality issues with its supplier of metal. The supplier explains that they employ two different processes when hardening

A manufacturer has been having some quality issues with its supplier of metal. The supplier explains that they employ two different processes when hardening a metal, via salt water or oil tempering. The manufacturer asks the supplier to take some samples of each process. The results are shown in the table below. a) Build a 95% confidence interval on the difference in means. (5 pts) Saltwater Oil 145 152 b) Build a 95% confidence interval on the ratio of the variances. (5 pts) c) What do you conclude? (5 points) 150 150 153 147 148 155 141 140 152 146 146 158 154 152 139 151 148 143

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