Nitterhouse Masonry Products, LLC, in Chambersburg, Pennsylvania, produces architectural concrete masonry products. The Dover is the largest block in a certain collection, is used primarily for...

Nitterhouse Masonry Products, LLC, in Chambersburg, Pennsylvania, produces architectural concrete masonry products. The Dover is the largest block in a certain collection, is used primarily for residential retaining walls, and is manufactured to weigh 40 pounds. A quality control inspector for the company randomly selected eight blocks, and the weight (in pounds) of each is given in the following table.

Assume the underlying population is normal and
 pounds. Is there any evidence to suggest that the true mean weight of the blocks is different from 40 pounds? Use
 and compute the p value to draw a conclusion.

At maximum takeoff weight, the Airbus A350-900 needs a runway of at least 8000 feet.33 To check this claim, officials from the FAA randomly selected A350-900 flights and measured the length (in feet) of the runway needed for takeoff. Assume
  Is there any evidence to suggest that the true mean runway length needed for takeoff of an Airbus A350-900 is greater than 8000 feet? Use the p value to draw a conclusion.