please explain clearly step by step I will give upvote definitely

(d) Given the following sample of Equity returns {-2, 0.15, 3, 1.2, 0.35, 0.2, -1, 2.5, 1.25, 0.0}. (i) Calculate the test statistic to test if the mean return is statistically greater than -1. [6] (ii) What statistical tables should be used to find the critical value for this test and why are these tables used? [2] (iii) Using the appropriate statistical tables, what is the critical statistic for this test at the 95% confidence level. [2] (iv) Based on the above, is the mean return statistically greater than -1? [2]