What assumptions tests can use the following instructions:

1. Create a histogram chart for each variable and each sample or group. Visually inspect the histogram for skewness or kurtosis. Do the data seem normally distributed for each variable? If not, the data are not normally distributed.
2. Conduct an F-Test to compare the populations for equal variances. Click the Data toolbar and choose "Data Analysis" from the Analysis Ribbon.
3. Select "F-Test Two-Sample for Variances." Choose the ranges of the two samples and click "OK." Is the F value greater than the F critical value? If so, the populations do not have equal variances.