How far is it from San Diego to San Francisco? An estimate of 632.125 miles is precise but not accurate. An estimate of somewhere between 400 and 500 miles is less precise but more accurate because the correct answer is 460 miles. Nevertheless, if you had no idea how far it is from San Diego to San Francisco, whom would you believe: someone who confidently says 632.125 miles, or someone who tentatively says somewhere between 400 and 500 miles? Probably the one who says 632.125 miles because precision creates the impression of certainty. ITE’s parking and trip generation rates illustrate a
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