In Case 2B, which expression defines Tcalc?

• A. (mean1 - mean2) / sqrt((s1^2/n1)+(s2^2/n2))
• B. (mean1 - mean2) / sqrt(s1^2/n1)
• C. (Icalculated mean 1-calculated mean 2I)/ sqrt((s1^2/n1)+(s2^2/n2))
• D. (Icalculated mean 1-calculated mean 2I)/ sqrt((s1^2/n1)+(s2^2/n2))

Answer: (D)