Sample size calculation for single mean
- Sudhir Verma |
- 11 steps |
- 2 minutes
Q. An investigator wants to estimate the mean systolic BP in children with congenital heart disease. How many children should be enrolled in the study with 95% CI and margin of error is 5 units, while the standard deviation is 20.
1
Navigate to [https://wnarifin.github.io/ssc_web.html](https://wnarifin.github.io/ssc_web.html)
2
Click "Single mean"
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Click this number field.
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Type "20" in the Standard deviation box.
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Click this number field.
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Type "5" in the precision box.
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now click on "calculate".
we will get the required sample 62 and adding 10% non response rate the final sample is 69
8
sample size =62
Now we can calculate for Standard deviation 15 instead of 20.
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Type "15" in SD box.
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Click this button field.
11
Click this number field.
