Given are five observations for two variables, x and y. (Round your answers to two decimal places.)

xi	3	12	6	20	14
yi	50	45	55	5	15

(a)Estimate the standard deviation of *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