Given are five observations for two variables, x and y. (Round your answers to two decimal places.) Xi 3 12 6 20 14 yi 60 35 55 5 15 (a) Estimate the standard deviation of y* when x = 8. (b) Develop a 95% confidence interval for the expected value of y when x = 8. to (c) Estimate the standard deviation of an individual value of y when x = 8. (d) Develop a 95% prediction interval for y when x = 8. to