An SRS of 500 high school wenion guised as surrape of it = 25 points in their sevond annmpt at the SAT Mathematics exam. Averne that the change in wore has s Normal diverlibution with standand deviation
\sigma =54
.
Yoe can find the critical vilues to three decimal places by using the last rut in uble C.
(a) Find a
90%
conflource interval for the mean change is wone
p
in the pepslatice of all high wheel miner. (Finer your awovers rounded to twe decimal places.)
lower bound of crefidence interval:
reper bound of coefiness interval:
(b) What is the magis of error for SOS
uarr
(Timer your mover nousled to fave docinal place.)
margin of mor
_(_())_(_())
creer roubled to three fesimal places.)
Tepis as ener