—Were you at home yesterday?
—No, I________. I was ________ school.
A:
wasn't;at
B:
weren't; at
C:
weren't;in
D:
wasn't;in
如果散点图的所有点都在一条直线上,则残差均为____ ,残差平方和为____ ,相关指数为____
(-1)2013的绝对值是( )