For Case 2A, which expression defines Tcalc?

For Case 2A, which expression defines Tcalc?

• A. Tcalc = (|mean1 - mean2| / spooled) * sqrt((n1*n2)/(n1+n2))
• B. Tcalc = (mean1 - mean2) / sqrt((s1^2/n1)+(s2^2/n2))
• C. Tcalc = (mean1 - mean2) / spooled
• D. Tcalc = (|mean1 - mean2|) / sqrt(n1+n2)

Answer: (A)