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.
The parents or caregiver should do to eliminate any obvious cause of hyperactivity in a boy in the kindergarten who can't concentrate to his school work is to use his hyperactivity in academic related activities in which they should help him engage more of his hyperactivity in activities that are academic related in means of eliminating hyperactivity in a way that does not contribute to his school work.
Answer:
Filter 1: Include U.S. and Canada
Explanation:
To see the data for users from the United States and Canada only "in a view" - this means at a time - this means that only one filter is needed for seeing the data for both countries. This therefore means that Filter 1: include U.S and Canada is the best filter that should be applied.
they all include studying, either history or people, or nature. they all include observing something and studying it.