A procrastinating graduate student wanted to examine the average tax returns (in dollars) as determined by three randomly selected tax preparation software packages, and based on whether the filing was completed in the first week of the tax season or the last week of the tax season. She tabulated her data collected from a total of 120 participants as follows: Tax Preparation Software Over Taxed TaxEasy TaxRight Filing First Week 560 550 510 Period Last Week 500 430 450 Using the given information, answer the following questions. Try and use names and phrases as mentioned in the question as much as possible. (i) What is the dependent variable: (ii) What is the first independent variable: (iii) What is the second independent variable: (iv) What are the total number of groups that are being analyzed