The Data Below Give the Weights in Ounces of Randomly-Selected

Multiple Choice

The data below give the weights in ounces of randomly-selected bars of bath soap produced by two different molding machines. The question of interest is whether these two molding machines produce soap bars of differing average weight. Find a 95% confidence interval for the population difference assuming that the weights for the two machines are approximately normal.

A) (-1.760, -0.091)
B) (-1.200, -0.464)
C) (-0.354, 0.173)
D) (-1.280, -0.384)