05 May 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.
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