The Standard Error for the Difference in Means If Two $\sqrt { \frac { S _ { M} ^ { 2 } + S _ { W } ^ { 2 } } { n _ {M} + n _ { W } } }$

question 22

Multiple Choice

The standard error for the difference in means if two random variables M and W, when the two population variances are different, is

• A) \(\sqrt { \frac { S _ { M} ^ { 2 } + S _ { W } ^ { 2 } } { n _ {M} + n _ { W } } }\)
• B) \(\frac { S _ { M} } { n _ {W } } + \frac { S _ { M } } { n _ { W } }\)
• C) \(\sqrt { \sqrt { \frac { 1 } { 2 } \left( \frac { S _ { M } ^ { 2 } + S _ { W} ^ { 2 } } { n _ { M } + n _ {W} } \right) } }\)
• D) \(\sqrt { \frac { S _ {M} ^ { 2 } + S _ { W} ^ { 2 } } { n _ { M } + n _ { W} } }\)