The program displays the difference Xbar - Ybar, the margin of error, and the confidence interval. The sum of the sample sizes n and m should be less than or equal to 71. Then enter .98 for C-Level, enter YES for Pooled, then press enter on Calculate. We can then access the statistics to enter these values into the program as explained in Section 13 . The data sets can have at most 35 measurements.
Males tend to score at the higher and lower ends while females' scores are more consistent.
However, the variance on other tests are usually equal. Moreover, males generally tend to average higher on mathematics tests while females tend to average higher on tests involving reading comprehension. So assume that Verbal SAT scores of girls and boys are normally distributed with a common variance. We wish to see if there is an appreciable difference in the average score. If we now consider Math SAT scores, then according to the article mentioned above, we can no longer assume equal variances among boys' scores and girls' scores.