There are two different techniques a given manufacturer can employ to produce batteries. A random selection of 12 batteries produced by technique I and of 14 produced by technique II resulted in the following capacities (in ampere hours):

Determine a 90 percent level two-sided confidence interval for the difference in means, assuming a common variance. Also determine a 95 percent upper confidence interval for μI − μII.

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Technique I Technique II 140 132 144 134 136 142 132 130 138 150 136 146 150 154 140 128 152 136 128 131 144 142 150 137 130 135