Composite decks are made of recycled wood and plastic, are low-maintenance and sturdy, and are designed to last much longer than traditional wood decks. A manufacturer of composite decks routinely...

Composite decks are made of recycled wood and plastic, are low-maintenance and sturdy, and are designed to last much longer than traditional wood decks. A manufacturer of composite decks routinely checks the surface wear as part of quality control. A sample of planks was obtained, and each was measured for surface wear using a Taber tester. The ordered observations (in Taber units) are given in the following table.

he Kellogg School of Management at Northwestern University has no minimum GMAT score to be accepted into the MBA program. However, they reported that the average GMAT for the class of 2013 was 715.31 A sample of students in this MBA program was obtained, and the GMAT score for each was recorded. Use the runs test with the normal approximation and a =0.05 to determine whether there is any evidence that the order of GMAT scores is not random.