6. What are the assumptions of this statistical test? Absence of Outliers. First, we will check for univariate and bivariate outliers. To check for univariate outliers, we will create a histogram of each variable. To do this, click Graphs -) Chart Builder... Next, click on Histogram under the Gallery tab on the bottom left. Drag the first image in the gallery to the Drop zone on the top right. Select the rst variable's name and drag it to the X'aXiS- Then ChECk the bOX next to "Display normal curve." Click OK. This should produce a graph in the Output Window. Copy and paste the histogram below. Then repeat this process with the second variable and place the graphs side by side