1. The Heterohelicacea have chambers that are typically biserial or triserial throughout. 2. The arms are subequal with biserial suckers. 3. The vomerine dentition of the species, in two anterior, biserial rows, which is described as a distinctive feature. 4. Thus, if the assumption holds, where there is a higher discrimination there will generally be a higher point-biserial correlation. 5. A non-directional formula for the rank-biserial correlation was provided by Wendt, such that the correlation is always positive. 6. If " X " can be assumed to be normally distributed, a better descriptive index is given by the biserial coefficient 7. However, point-biserial correlations and percentage of students who answered each item correctly are examined after each administration of the test. 8. In form, rotaliid tests are typically enrolled, but maybe reduced to biserial or uniserial, or may be encrusting with proliferated chambers. 9. There is a formula to compute the rank-biserial from the Mann Whitney " U " and the sample sizes of each group: 10. As you might imagine, this is not the easiest thing in the world to calculate and the biserial coefficient is not widely used in practice.
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