The primary responsibility of air traffic controllers is the separation of aircraft. They control traffic in and around airports and in the terminal and en route airspace in between. Controllers speak directly with pilots, notifying them of traffic or weather in there vicinity.
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Unity is the appearance or condition of oneness in a work of art.
Unity in art refers to the phenomenon when one element in a work of art is connected to another element or elements. Unity in art makes it wholesome, harmonious and pleasing to the eye. Unity in a work of art makes the viewer perceive it holistically rather than focusing on individual details. Attached are two examples of unity in artwork.
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In the Midwest of US. Mostly mountains
Answer:
1. Co-variance= -1.2
2. correlation coefficient= -0.4404
3. There is weak negative relationship between x and y.
Explanation:
1.
Co-variance= Cov(x,y)= sum[(x-xbar)(y-ybar)]/n
xbar=sumx/n=32/5=6.4
ybar=sumy/n=35/5=7
x 7 8 5 3 9
x-xbar 0.6 1.6 -1.4 -3.4 2.6
y 7 5 9 7 7
y-ybar 0 -2 2 0 0
(x-xbar)(y-ybar) 0 -3.2 -2.8 0 0
Cov(x,y)= sum[(x-xbar)(y-ybar)]/n=-6/5=-1.2
Cov(x,y)=-1.2
2.
correlation coefficient=r

x 7 8 5 3 9
x-xbar 0.6 1.6 -1.4 -3.4 2.6
y 7 5 9 7 7
y-ybar 0 -2 2 0 0
(x-xbar)(y-ybar) 0 -3.2 -2.8 0 0
(x-xbar)² 0.36 2.56 1.96 11.56 6.76
(y-ybar)² 0 4 4 0 0

r=-0.4404
3. Since the value of correlation coefficient is negative and less than 0.5 , so, we can say that there is weak negative relationship between x and y.