A test is to be conducted involving the mean holding power of two glues designed for plastic ...

  

1. A test is to be conducted involving 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:

Epox Holdtite

Sample mean 250 252

Sample standard deviation 5 8

Sample size  12 10

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

that of Holdtite?