A curve passes through the point 1,-11 and its gradient at any point is ax2+b, where a and b are constants. The tangent to the c
1 answer:
You might be interested in
The way we solve inequalities with absolute values is that you take the original equation, and turn it into this:
Now we can get rid of the absolute value and solve:
So, I got -2 < x < 8, which is obviously not an option. But, since the question asks for the subset, which is just a part of the answer set, the answer is D. Note that -1 < x < 7 falls within -2 < x < 8, and thus, D is the answer.
The correlation coefficient has to do with how well the points line up. If they are all on a line with positive slope, the correlation coefficient is 1. If that line has negative slope, the correlation coefficient is -1.
When the points are not on a line, the magnitude of the correlation coefficient is related to how "scattered" the points are. Completely random points that lie on no discernible line have a correlation coefficient of 0.
The given points lie near a line with positive slope, so the correlation coefficient is near 1. The most appropriate choice here is r = 1.
_____
The computed value of the correlation coefficient for this data is 0.968.
