The calculation of the sample size. Sample size calculation formula is used to compare two population mean that it is free. From the formula: (jitima tantayaporn dawn wind, 2553)
The sample size calculation The sample size was calculated using the formula To compare the two populations that are independent from the formula (Dawn Jirawat Gul, 2553).
Calculation of sample size. Using formulae sample size. To compare the two groups of population independent from the formula as follows (Arun. By measuring said Gul, 2553).