I want to examine whether age Impacts children's perceptions of masked faces during COVID. I have a random sample of children- 4year-olds and 45 8-year-olds. show each child a photo of a masked person and ask them to rate how kind they think each person is on a scale from . then compare the mean scores of the 4-year-olds to the mean scores of the 8 yearolds.A. What is the independent variable of this study?B. Using the scenario above, is this an experimental or a non-experimental study? C. Using the scenario above, Is this a between or within? D. What would be the degrees of freedom for the above scenario? E. In a one-sample t-test, we are comparing a sample to a population. In an independent groups t-test, we are comparing ?