Stiktite Inc. plans a test of the mean holding power of two glues designed for plastic. First, a small plastic hook was coated at one end with Epox glue and fastened to a sheet of plastic. After it dried, weight was added to the hook until it separated from the sheet of plastic. The weight was then recorded. This was repeated until 12 hooks were tested. The same procedure was followed for Holdtite glue, but only 10 hooks were used. The sample results, in pounds, were:

At the .01 significance level, is there a difference between the mean holding power of Epox and that of Holdtite?

State:

(a) The null and the alternate hypotheses,

(b) The decision rule,

(c) The decision regarding the null hypothesis,

(d) Then interpret the result.

Holdtite Sample size Sample mean 12 10 250 252 Sample standard deviation 8