Consider the following data for a dependent variable y and two independent variables, x1 and x2. The estimated regression equation for the data is y=18.4+2.01x1+4.74x2 (a) Develop a 95% confidence interval for the mean value of ) Jwhen x1=51 and x2=16. (Round your answers to three decimal places.) to (b) Develop a 95% prediction interval for y when x1=51 and x2=16. (Round your answers to three decimal places.) to.