No difference among mean pain experienced by children in the three anxiety groups. No difference between mean pain experienced by boys and girls. No difference among mean pain experienced by boys and girls conditional on or mediated by their level of needle anxiety. Test of Interaction Effect Alternative Hypothesis Mean pain experienced by children in the three anxiety groups are not equal. Mean pain experienced by boys and girls is not equal.
Mean pain experienced by boys and girls is conditional on their level of needle anxiety.
Before conducting this parametric test, you should assess study variables for possible violations of the assumptions underlying this test. Dependent variable is a continuous variable measured at the interval or ratio level More than one categorical-level independent variables. Each consisting of two or more levels. The various levels of the independent variables may be naturally-occurring or manipulated by the researcher Data from each of the various sample groups are approximately normally distributed. Note the increasing complexity associated with testing for violations of the last two assumptions when we starting considering the number of different groups involved.