The scatterplot shows the relationship between x and y for the 9 data points in data set A.

The scatterplot has 9 data points.
The data points are in a quadratic pattern opening upward.
(negative 4 comma 7.5)
(O comma 6.6)
(3.5 comma 6.9)
A quadratic model for the data in data set A can be written as
. The graph of this model is shown in the
-plane. The data point at
was found to be the result of a recording error and was removed from data set A to create data set B, consisting of the remaining 8 data points. A quadratic model for the data in data set B can be written as 
, where
, and
are constants. If the quadratic models for data sets A and B are calculated in the same way, which of the following statements must be true?
I. 
ll. 