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

xi	1	2	3	4	5
yi	4	7	6	12	13

(a)Use

s_*=s

1 n + (x*x)2 (xix)2

to estimate the standard deviation of

*

when

x=4.

(b)Use

*t_/2s_*

to develop a 95% confidence interval for the expected value ofywhen

x=4.

to (c)Use

s_pred=s

1 + 1 n + (x*x)2 (xix)2

to estimate the standard deviation of an individual value ofywhen

x=4.

(d)Use

*t_/2s_pred

to develop a 95% prediction interval forywhen

x=4.

to