Two Independent Samples of Sizes 50 and 50 Are Randomly $\mu _ { 1 } - \mu _ { 2 }$

question 42

Multiple Choice

Two independent samples of sizes 50 and 50 are randomly selected from two populations to test the difference between the population means, $\mu _ { 1 } - \mu _ { 2 }$
) The sampling distribution of the sample mean difference $\bar { x } _ { 1 } - \bar { x } _ { 2 }$
Is:

• A) normally distributed
• B) approximately normal
• C) t - distributed with 98 degrees of freedom
• D) chi-squared distributed with 99 degrees of freedom

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