Pittsburgh Paints wishes to test an additive formulated to increase the life of ...

  

1. Pittsburgh Paints wishes to test an additive formulated to increase the life of paints used in the hot and arid conditions of the Southwest. The top half of a piece of wood was painted using the

regular paint. The bottom half was painted with the paint including the additive. The same procedure was followed for a total of 10 pieces. Then each piece was subjected to brilliant light.

The data, the number of hours each piece lasted before it faded beyond a certain point, follow:

Number of Hours by Sample

A B C D E F G H I J 

Without additive 325 313 320 340 318 312 319  330 333 319

With additive 323 313 326 343 310 320 313 340 330 315

Using the .05 significance level, determine whether the additive is effective in prolonging the life

of the paint.