please solve with minitab

(2-sample t Testing and 2-variances testing and Normal Probability Plot on Minitab) Two different hardening processes (1) saltwater quenching and (2) oil quenching are used on samples of a particular type of metal alloy. The results are shown in Table 1 below. Assume that hardness is normally distributed. HARDNESS DATA (Problem 4) Saltwater Quench Oil Quench 145 152 150 150 153 147 148 155 141 140 152 146 146 158 154 152 139 151 148 143 Saltwater quench: n = 10, x = 147.6, s = 4.97; Oil quench: n = 10, x = 149.4, s = 5.46 (a) Test the hypothesis that the mean hardness for the saltwater quenching process equals the mean hardness for the oil quenching process. Use a 0.05 and assume equal variances. (b) Assuming that the variances of and o2 are equal, construct a 95% confidence interval on the difference in mean hardness. (c) Construct a 95% confidence interval on the ratio 02/02 Does the assumption made earlier of equal variances seem reasonable? (d) Does the assumption of normality seem appropriate for these data