I need to conduct an experimental group for pregnant women. I divided participants into two groups: Group one perform breathing exercises in two positions. Group two performs breathing exercises in one position only (this is my control group). Based on my knowledge the statistical test I should do is an independent t-test. Am I Right?
If I am right. how can I measure the effect size for this study to estimate sample size?
Yes, you are right, an independent t-test should be used. Both the group subjects are not the same.
you can follow my research article under sleep disorder which includes the breathing technique (Pranayama) group.
Sample Size:
Confidence Level: 95%
Margin of Error: 5%
For example,
Population Proportion: 4% [From ICMR prevalence report]
Population Size: 35 [From Mumbai Obesity Project]
The sample size was calculated from the following formula.
Necessary Sample Size = [Z-score x Std Dev]2 / [margin of error]2
N= [1.96x12.23]2/ [5]2 = [23.9]2/ [5]2= 22.9 = 23
This means 23 or more Subjects are needed to have a confidence level of 95% that the real value is within ±5% of the measured/surveyed value.
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