The Essentials ofComputer(computer) 474

# The Essentials ofComputer(computer) 474 - These formulas...

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Program Average 1180 1180 1180 System A Execution Time System B Execution Time System C Execution Time v w x y z 50 200 250 400 5000 100 400 500 800 4100 500 600 500 800 3500 TABLE 10.1 The Arithmetic Average Running Time in Seconds of Five Programs on Three Systems These formulas are useful in comparing the average performance of one system with the average performance of another. However, the number that we end up with is as much dependent on our definition of “average” as it is on the actual performance of the systems. 10.3.1 What the Means Mean The science of statistics tells us that if we want meaningful information, we must conduct an adequate number of tests in order to justify making inferences based on the results of the tests. The greater the variability in the test, the larger the sam- ple size must be. After we have conducted a “sufficient” number of tests, we are left with the task of combining, or averaging, the data in a way that makes sense, forming a concise measure of central tendency . Measures of central tendency indicate to us the expected behavior of the sampled system (population). But not
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