Parameters
Expected Standard Deviation
0.8
Expected spread of ratings across subjects. Typical values: 0.8–1.0 for ACR scales.
Desired MOS Difference
1.0
Minimum MOS difference you want to detect. E.g., 1.0 = one quality level on a 5-point ACR scale.
Number of Comparisons
100
Number of t-test comparisons planned. Used for Bonferroni correction to control Type I errors.
Desired Power
0.80
Probability of detecting a true effect (1 − Type II error). Typically 0.80.
Type of Test
Paired: same subjects rate both conditions. Independent: different subject groups.
Results
Minimum Subjects Required
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subjects
Effect Size (d)
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Adjusted Alpha
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Base Alpha
0.05
Correction
Bonferroni