When Testing for Differences of Means, You Can Base Statistical $n _ { w }$

Multiple Choice

When testing for differences of means, you can base statistical inference on the

A) Student t distribution in general
B) normal distribution regardless of sample size
C) Student t distribution if the underlying population distribution of Y is normal, the two groups have the same variances, and you use the pooled standard error formula
D) Chi-squared distribution with ( $n _ { w }$ + $n _ { m }$ - 2) degrees of freedom