Variables Definitions

1. Minimum: The smallest value in the dataset or sample.
2. Maximum: The largest value in the dataset or sample.
3. Sample Size (N): The total number of data points or observations in the sample.
4. Estimated SD: The calculated standard deviation estimated from the provided range and sample size.

Conversion Formula

The conversion process involves several steps to estimate the standard deviation based on the given range (R) and sample size (N):

1. Calculate the Range (R):

   

   

2. Determine the Conversion Factor (f):
   • The conversion factor (f) is dependent on the sample size (N).
   • The tool provides a range of conversion factors for different sample sizes based on empirical values. These values were mentioned in the Walter et al method.
3. Calculate the Estimated Standard Deviation:

   

**Formula Reference - Walter et al**