Hi, can you show me how do these questions in detail please, thank you

Exercise 3 A psychologist is hired to compare the levels of job satisfaction of salespersons at three large companies, Firm A, Firm B and Firm C. Ten salespersons are selected at random from each firm and given in-depth tests to ascertain their level of job satisfaction on a scale 0, 1, ..., 100. The results are saved in the a2e3.xlsx file (below). (a) (6 marks) What is the variable of interest? Is it qualitative or quantitative? If it is qualitative, is it ranked or unranked? If it is quantitative, is it discrete or continuous? What is its level of measurement? What is the experimental design? Explain your answers. (b) (9 marks) Perform a parametric test at the 1% significance level with R to find out whether there are differences in the salespersons mean job satisfaction among the three firms. State the hypotheses, report the observed test statistic, make a statistical decision, and draw the implied conclusion. (c) (9 marks) Perform a nonparametric test at the 1% significance level with R to find out whether there are differences in the salespersons median job satisfaction among the three firms. State the hypotheses, report the observed test statistic, make a statistical decision, and draw the implied conclusions. (d) (9 marks) What conditions are required by the tests you performed in parts (b) and (c)? Are they satisfied this time? Provide as many supporting evidence as possible. (e) (3 marks) In the light of your answers in parts (b), (c) and (d), what conclusion should the psychologist arrive at? How confident one can be in this conclusion? Explain your answers.

Firm_A	Firm_B	Firm_C
67	66	87
65	68	80
59	55	67
59	59	89
58	61	80
61	66	84
66	62	78
53	65	65
51	64	72
64	74	85