During a marketing research, you collect the following data about the mean daily hours spent watching TV and the mean daily hours spent doing physical activities in a group of teenagers: Hours of TV (x) Teen A 3.8 Teen B 3.3 Teen C 2.4 Teen D 1.1 Teen E Teen F 3.3 2.8 (a) Find the equation of the regression line (round the coefficients to 4 decimal places): y' = Hours of physical activity (y) + 0.3 63 0.8 2.4 2.7 2.9 (b) Find a point estimate for the predicted number of hours spent doing physical activities for a teen who watches TV for 2.2 hours a day (round the values to 1 decimal place): (c) Calculate the coefficient of correlation between the 2 variables, rounded to 3 decimal places: (d) What percentage (rounded to 1 decimal place) of the variability of the y variable is explainable in terms of the variability of the x variable? %