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

question 4

Multiple Choice

The standard deviation of $\bar { X } _ { 1 } - \bar { X } _ { 2 }$ is also called the:

• A)standard error of the difference between two sample means.
• B)standard deviation of the difference between the population means.
• C)normal approximation to the difference of two binomial random variables.
• D)None of these choices.

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