Answer:
So then the correlation coefficient would be r =0.8465
And the best options would be:
(D) 0.847
Step-by-step explanation:
Previous concepts
The correlation coefficient is a "statistical measure that calculates the strength of the relationship between the relative movements of two variables". It's denoted by r and its always between -1 and 1.
And in order to calculate the correlation coefficient we can use this formula:
Solution to the problem
Data given:
X: 8 10 7 13 7 9 9 10 11 8
Y: 60 75 55 83 61 73 80 85 85 66
For our case we have this:
n=10
And if we replace into the formula we got:
So then the correlation coefficient would be r =0.8465
And the best options would be:
(D) 0.847
<span>70=2(x+x-9)
</span><span>2x-9=35
x=22
</span><span>length 22, width 13</span>
Answer:3 breakfast bars for£1.50
Step-by-step explanation:if you got two packs you would have 6 bars for three pound when one of the offers was 5 breakfast bars for 3 pound so the 3 breakfast bars for £1.50 is the best offer.
Answer:
Area of the circle with diameter 14cm is 154.35 cm squared.
Step-by-step explanation:
Since d=2r, we know that r=1/2D=7cm
We also know that the area of a circle can be found using the following equation: pir^2
We can plug in pi=3.14 and r=7 to get
area=(3.14)(7)^2=3.14*49=154.35cm^2
Answer:
The volume of the sphere is eight times the volume of hemisphere
Step-by-step explanation:
we know that
If two figures are similar, then the ratio of its volumes is equal to the scale factor elevated to the cube
Let
z-----> the scale factor
x-----> volume of the hemisphere
y-----> volume of the sphere
in this problem we have
substitute
that means------> The volume of the sphere is eight times the volume of hemisphere