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With over 100 degrees of freedom, the minimum sample size was 132 to achieve a power of.80.
This converter is used as PFC due to its capability to achieve a power factor close to unity.
In fact, those who could not achieve a power output greater than or equal to 125 W were excluded.
This kind of power converters are able to mitigate the harmonic pollution and thus, achieve a power factor close to unity.
Our goal was to achieve a power of 80%% for a 0.05 significance level (alpha error) using a two-tailed unpaired t test.
With a group distribution of 3/1 and a type-1 error risk of 0.05, the inclusion of 56 patients was necessary to achieve a power of 80%.
To achieve a power of 80%, 11 patients would be required.
Table 6 gives the required numbers to achieve a power of 80% with significance level of 5%.
The sample size was calculated, based on a medium effect size, to achieve a power level of over 85% [ 8].
Power analysis required 20 patients in each group to achieve a power of 0.9 and significance of P < 0.05.
The sample size required to achieve a power of 80% for a two-sided χ test at α=0.05 is 175 participants in each study arm.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com