What is the formula for calculating the g_calculated value in the Grubbs test?

• A. The absolute difference between the questionable value and the median, divided by the range.
• B. The sum of all values divided by the number of observations.
• C. The absolute difference between the questionable value and the mean, divided by the standard deviation.
• D. The absolute difference between the maximum and minimum values, divided by the mean.

Answer: (C)