What is the approximate difference in elevation between Austin and the Hill Country just to the west?

The correct answer to this open question is the following.

The approximate difference in elevation between Austin and the Hill Country just to the west is about 1000 to 1,500 feet, depending on the city or location in the Texas Hill Country in Central Texas.

In this case, the elevation of Austin, the capital city of the state of Texas is 621 feet. If we compare its elevation with, let's say, Fredericksburg, that is close to Austin, Fredericksburg has an elevation of 1,685 feet. Other cities and towns that are part of the Texas Hill are Brady, Del Rio, Junction, and San Saba. These places are full of different kinds of vegetation and wildlife.

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answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.