I WILL MARK PLUS GIVE 33+
In the U. S., from 2004 - 2015, the correlation coefficient for the relationship

between the size of a cell phone data plan, x, and the number of text

messages sent, y, is r = +0.97. Describe the relationship between the data

plan size and the number of text messages sent in the U. S.

There is a very strong positive correlation between size of a cell phone data plan and the number of text  messages sent in the U.S.

Step-by-step explanation:

The correlation coefficient is a statistical degree that computes the strength of the linear relationship amid the relative movements of the two variables (i.e. dependent and independent).It ranges from -1 to +1.

Positive correlation is an association amid two variables in which both variables change in the same direction.  A positive correlation occurs when one variable declines as the other variable declines, or one variable escalates while the other escalates.

Negative correlation is a relationship amid two variables in which one variable rises as the other falls, and vice versa.

The correlation coefficient for the relationship  between the size of a cell phone data plan, x, and the number of text  messages sent, y is:

r = +0.97.

The correlation value is very close to +1.

So, we can say that there is a very strong positive correlation between size of a cell phone data plan and the number of text  messages sent in the U.S.

answer: the answer is 40.82

step-by-step explanation: 3.14 x 13(or half of 26) to the power of 2