performance test definition maths what is the meaning of significant change in runtime and variability? what is the meaning of a change in the average vs the average what is signal test what is the meaning of the term performance when a performance test is performed how can an error be detected what is the difference between a change in the average runtime and a change in the variance in a process? what is the definition of significative change what is the definition of significant performance what is a performance test what is meant by the term performance test what is the significance of the change in the mean and variance of the record? how to measure performance in a stochastic process what is the average variance of a stochastic system? how to test for performance changes what is the difference between normal and stochastic what is the difference between a mean and variation of a process? define variance and mean what is the difference between a change in the average runtime of a system and a variance of a process why do we need to measure performance