The article “Refinement of Gravimetric Geoid Using GPS and Leveling Data” (W. Thurston, Journal of Surveying Engineering, 2000:27–56) presents a method for measuring orthometric heights above sea...

The article “Refinement of Gravimetric Geoid Using GPS and Leveling Data” (W. Thurston, Journal of Surveying Engineering, 2000:27–56) presents a method for measuring orthometric heights above sea level. For a sample of 1225 baselines, 926 gave results that were within the class C spirit leveling tolerance limits. Can we conclude that this method produces results within the tolerance limits more than 75% of the time?