Given are five observations for two variables, x and y. (Round your answers to two decimal places.) (a) Use sy=sn1+(x1x)2(xx)2 to estimate the standard deviation of ^ when x=4. (b) Use y^t/25y to develop a 95% confidence interval for the expected value of y when x=4. to (c) Use spred=s1+n1+(x1x)2(xx)2 to estimate the standard deviation of an individual value of y when x=4. (d) Use y^t/25pred to develop a 95% prediction interval for y when x=4. to.