Basicmedical Key

However, because of the nature of the syndrome, we are at liberty to do the study a little differently than the usual approach. Assuming that committees meet only every week…

OFVARIANCE CHAPTER THE SEVENTH Comparing Two Groups The t-Test The t-test is used for comparing the means of two groups and is based on the ratio of the difference between…

You may wonder why we need three data points, since we can fit a perfectly straight line with only two. There are three answers to this: one methodological, one statistical,…

FIGURE 16-1 Individual relationship between Pathos Quotient (PQ) and Treatment (A), Belt size (B), and Age (C). TABLE 16–1 Data for 16 PMS patients TABLE 16–2 ANOVA of regression for…

FIGURE 12-1 Men’s (left side) and women’s (right side) satisfaction scores, depending on who’s on top. The second problem is that of multiple testing. As we saw in Chapter 5,…

versus the alternative hypothesis (HA) that the parameters aren’t equal: But, the null hypothesis doesn’t always have to postulate no difference between or among the groups. Null, in this case,…

Notice that in the lower left corner, there’s one tab labeled Data View and another called Variable View (which is the screen we’re in now). Clicking on these allows you…

CHAPTER THE TWENTY-EIGHT Screwups, Oddballs, and Other Vagaries of Science Locating Outliers, Handling Missing Data, and Transformations In this chapter, we discuss ways of locating anomalous data values, how to…

TABLE 17–2 ANOVA of pretest and post-test scores for the RCT of RRP If that’s all we did, then the straightforward analysis is, as we already indicated, an unpaired t-test…

. So the test, called a paired t-test, is equal to: TABLE 10–1 Pretest and post-test weights of 12 Casimir subjects In this case, it equals . Now, the critical…