In Practice, the Standard Error of the Difference Between Means $\sqrt { \left. \frac { \left( \sigma _ { 1 } \right) ^ { 2 } } { n _ { 1 } } + \frac { ( \sigma } { n _ { 2 } } \right) ^ { 2 } }$

question 81

Multiple Choice

In practice, the standard error of the difference between means is estimated by.

• A) \(\sqrt { \left. \frac { \left( \sigma _ { 1 } \right) ^ { 2 } } { n _ { 1 } } + \frac { ( \sigma } { n _ { 2 } } \right) ^ { 2 } }\)
• B) \(s _ { \bar { x } _ { 1 } - \bar { x } _ { 2 } }\)
• C) \(\left( s _ { \bar { x } _ { 1 } - \bar { x } _ { 2 } } \right) ^ { 2 }\)
• D) \(\frac { \sigma _ { 1 } } { n _ { 1 } } + \frac { \sigma _ { 2 } } { n _ { 2 } }\)

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