Answer:
Step-by-step explanation:hhhj
Answer:
r = 0.99
Very strong positive correlation between x and y
Step-by-step explanation:
Given is a data containing years and the corresponding heights
We have to find the correlation coefficient.
x y
1 2.1
2 3.2
3 6.8
4 7.3
5 11.2
6 12.6
7 13.4
8 15.9
r 0.988670694
Formula for r is
![\frac{n\Sigma xy -\sigma x \Sigma y}{\sqrt{(n\Sigma x^2 -(\Sigma x)^2)*}(n\Sigma y^2 -(\Sigma y)^2 }](https://tex.z-dn.net/?f=%5Cfrac%7Bn%5CSigma%20xy%20-%5Csigma%20x%20%5CSigma%20y%7D%7B%5Csqrt%7B%28n%5CSigma%20x%5E2%20-%28%5CSigma%20x%29%5E2%29%2A%7D%28n%5CSigma%20y%5E2%20-%28%5CSigma%20y%29%5E2%20%7D)
Thus we find that correlation coefficient is 0.988670694
Rounding off to two decimals r = 0.99
Very strong positive correlation between x and y
Answer: A, B, C, D
Step-by-step explanation:
A. This is true because all rhombi are parallelograms, and diagonals of a parallelogram bisect each other.
B. This is true because the diagonals of a rhombus are perpendicular.
C. This is true because diagonals of a rhombus bisect the angles from which they are drawn,
D. This is true because all sides of a rhombus are congfruent.
E. This is not always true - all rhombi are parallelograms, and adjacent angles of a parallelogram are supplementary, but not always congruent.
F. This is not always true - diagonals of a rhombus are not always congruent.
It's a COMBINATION where 7 are chosen out of 11
₁₁C₇ = (11!)/(7! , 4!) = 330 combinations