Body voltage testing â also called skin voltage testing â is the most sensitive, accurate and helpful method available to detect electric fields. This is a very important measurement, especially for sensitive individuals.
An outlier can be created by a shift in the location. (mean) or in the scale (variability) of the process. Though an observation in a particular sample might be a. candidate as an outlier, the process might have shifted. Sometimes, the spurious result is a gross recording. error or a measurement error.
But the presence of outliers is likely to have a strong effect on the mean and the standard deviation, making this technique unreliable. As you can see, the extreme value at x=90 has dragged xÌ+2s, the outlier cutoff, above the point at x=52.