Use a graphing calculator or other technology to answer the question.
Which quadratic regression equation best fits the data set?


y
ˆ
=2.608
x
2
+115.265x+1568.065


y
ˆ
=2.608
x
2
−115.265x+1568.065


y
ˆ
=1568.065
x
2
−115.265x+2.608


y
ˆ
=1568.065
x
2
+115.265x+2.608
x
y
15
423
17
398
19
308
20
255
21
297
25
365
29
401