The data below give the weights in ounces of randomly-selected bars of bath soap

Question

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. The computed test statistic was found to be -1.61. Find the P-value for the this test assuming that the weights for the two machines are approximately normal..

0.892

0.108

0.946

0.054

Weights (ounces) Machine 1 11.4      12.4      12.1      11.8      11.8      11.7      12.3      12.0      11.8 Machine 2 13.0      12.4      12.4      12.1      12.3      12.1      12.5      12.0      12.1

Explanation / Answer

As test statistic = -1.61

For two tailed test at 0.05 significance level with z value = -1.61

We get p value = 0.108

Answer is option B)

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