The PML-test outperformed the power for all other four exponentiality tests across all sample sizes and significance levels. In all parameter settings under investigation, the powers for the LF-test were the lowest as compared to other four exponentiality tests. The powers of the S-test and VS-test were almost identical across all sample
sizes and significance levels. For a fixed significance level, the powers for the D-test were greater than the
S-test and VS-test for small sample sizes but this relationship was reversed for medium to large sample sizes.
For all significance levels with sample sizes at least 200, the powers for all five exponentiality tests were almost equal and they approach 1.