please assist answer with detail step by step, not only short answers I need every single step answer very detailed also explaining by curve or graph (if any) and formula how to get it ( note : please make clear writting and no scribbles cause i will save for my file document for study)

1. Based on the following sample (Ml data: X 2 6 \\O 13 20 y 7 18 \\O 26 23 a. Make a model of the regression equation b. Calculate the approximate value of Y for X = 27 c. Calculate the coefficient of determination (\"2). What is the interpretation of this coefficient of determination? d. What is the correlation coefficient (r)? What does that mean? 2. There is a presumption that employees' GPA and monthly income are correlated. The following data is the results of a survey of six employees of PT "JM", (salaries in hundreds of thousands of rupiah).) GPA 2,5 3,4 3,6 3,1 3,5 2,8 Salary 43 46 40 45 48 34 a. b. salary when the GPA = 3.8. Is the correlation positive? (Calculate the correlation coefficient) Create a linear regression equation of salary over GPA; calculate the estimated [Two additives were tested on passenger cars to determine whether they had an effect on distance (miles) per gallon. The results of the trial on 6 passenger cars are illustrated in the following data: Car Additive A Additive B 1 20,12 18,05 2 23,55 21,77 3 24,77 22,57 4 18,55 14,98 5 19,15 17,05 5 24,23 21,15 Use 0: = 0.05 and the Wilcoxon Rating Test Count to show if there is a difference in the average distance the car traveled according to the two additives