The Estimated Standard Deviation Of $\bar { x } _ { 1 } - \bar { x } _ { 2 }$

question 4

True/False

The estimated standard deviation of $\bar { x } _ { 1 } - \bar { x } _ { 2 }$ used in hypothesis tests about $\mu _ { 1 } - \mu _ { 2 }$ is the same as the estimated standard deviation used in calculating confidence intervals for $\mu _ { 1 } - \mu _ { 2 }$ .