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40000 feet = 7.6 miles
Elevate above the level of the heart. Roughly 12 inches
It depends on the significance level required. And that, in turn, will depend on the cost of making the wrong decision. For ordinary use, a 95% significance level will require 1.96 sd
2977 (us) gallons Filled to the brim probably closer to 2500 for normal fill level
Altitudes above vs. below sea level; having money vs. owing money; moving in one direction vs. moving in the opposite direction; being above and below a certain reference level (for calculating potential energy). In general, in many situations where you have two opposites, one can be called "positive", the other "negative".