A study of class attendance and grades among first-year students at a state university showed that in general students who attended a higher percent of their classes earned higher grades. Class attendance explained 81% of the variation in grade index among the students. What is the numerical value of the correlation between percent of classes attended and grade index

r = 0.9

Step-by-step explanation:

Correlation is denoted by r. r² is usually used to measure variation along the line as a fraction of the total variation.

We are told class attendance explained 81% of the variation in grade index among the students. Thus, for this regression, the variation is;

r² = 81%

Or r² = 0.81

Thus, the numerical value of the correlation r would be;

r = √0.81

r = 0.9

the multiples of 15 are 15, 30,45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195,   210, 225, 240, 255, 270, 285, 300, 315, 330, 345, 360, 375,   390, 405, 420, 435, 450, 465, 480, 495, 510, 525, 540, 555, 570, 585, 600, 615, 630, 645, 660, 675, 690, 705, 720, and 735.

the factors of 15 are 1, 3, 5, and 15.

hope that , fam!

-une, your fren : )

4

step-by-step explanation:

im pretty sure it's 4 beacsue 8/2 equals 4