Question

A trial is a single performance of an _________________

Answer 1

A trial is a single performance of an well-defined experiment.

Referenced on Wolfram|Alpha.

REFERENCES:

Papoulis, A. "Repeated Trials." Ch. 3 in Probability, Random Variables, and Stochastic Processes, 2nd ed. New York: McGraw-Hill, pp. 47-82, 1984.