If the p value is less than or equal to, we reject the null hypothesis, otherwise we do not reject the null hypothesis. One tail and two tail tests. In a one tail test, the rejection region is at one end of the distribution or the other.In a two tail test, the rejection region is split between the two tails.4) Test statistic. As the population variance is known, we use z as the test statistic. (a) Distribution of test statistic. If the assumptions are correct and is true, the test statistic follows the standard normal distribution.
Cameron lesions are linear erosions or ulcerations of the mucosal folds lining the stomach where it is constricted by the thoracic diaphragm in persons with large hiatal hernias. The lesions may cause chronic blood loss resulting in iron deficiency anemia; less often they cause acute bleeding.
An ecchymosis is a subcutaneous spot of bleeding (from extravasation of blood) with diameter larger than 1 centimeter.It is similar to (and sometimes indistinguishable from) a hematoma, commonly called a bruise, though the terms are not interchangeable in careful usage.pecifically, bruises are caused by trauma whereas ecchymoses, which are the same as the spots of purpura except larger, are not necessarily caused by trauma, often being caused by pathophysiologic cell function. A broader definition of ecchymosis is the escape of blood into the tissues from ruptured blood vessels.