For the independent-measurest test, which of the following describes the pooled variance (whose symbol is O A weighted average of the two sample variances (weighted by the sample sizes) O An estimate of the standard distance between the difference in sample means (M: - M2) and the difference in the corresponding population means (u1 - Pa) O The difference between the standard deviations of the two samples O The variance across all the data values when both samples are pooled together For the independent-measurest test, which of the following describes the estimated standard error of the difference in sample means (whose symbol is )? O The variance across all the data values when both samples are pooled together O An estimate of the standard distance between the difference in sample means (M: - M2) and the difference in the corresponding population means (us - Uz) O The difference between the standard deviations of the two samples O A weighted average of the two sample variances (weighted by the sample sizes) In calculating , you typically first need to calculate is the value used in the denominator of