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Serhud [2]
3 years ago
6

Consider the following sample data for two variables. x y 7 7 8 5 5 9 3 7 9 7 Calculate the sample covariance. b. Calculate the

sample correlation coefficient. c. Describe the relationship between x and y.
Mathematics
1 answer:
Semmy [17]3 years ago
4 0

Answer:

a) Sample co-variance = -1.5

b) Sample correlation = -0.4404152

c) Weak negative relationship between X and Y.

Step-by-step explanation:

a) by sample co-variance = sum ((x - xbar)* (y-ybar)/n-1

#.... use the following program in R

x = c(7,8, 5, 3, 9)

y = c(7,5,9,7,7)

sv = sum((x-mean(x))*(y-mean(y)))/4

cor(x,y)

####################################

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-7h+3(4-6h)=127 is h= 25?
GREYUIT [131]

Answer:

No, h = (-23)/5

Step-by-step explanation:

Solve for h:

3 (4 - 6 h) - 7 h = 127

3 (4 - 6 h) = 12 - 18 h:

12 - 18 h - 7 h = 127

-18 h - 7 h = -25 h:

-25 h + 12 = 127

Subtract 12 from both sides:

(12 - 12) - 25 h = 127 - 12

12 - 12 = 0:

-25 h = 127 - 12

127 - 12 = 115:

-25 h = 115

Divide both sides of -25 h = 115 by -25:

(-25 h)/(-25) = 115/(-25)

(-25)/(-25) = 1:

h = 115/(-25)

The gcd of 115 and -25 is 5, so 115/(-25) = (5×23)/(5 (-5)) = 5/5×23/(-5) = 23/(-5):

h = 23/(-5)

Multiply numerator and denominator of 23/(-5) by -1:

Answer:  h = (-23)/5

4 0
3 years ago
Graph the linear equation. find three points that solve the equation x+y=-2
vagabundo [1.1K]

Answer:

See the graph of the given linear equation shown below.

Explanation:

Given the linear equation : x+y = -2

We make a table for values of x and y;

x               y = -2-x

0               -2

-2               0

1                -3

Now, plot these three points (0, -2) , (-2, 0) and (1, -3) on the coordinate plane.

You can see the graph as shown below.


6 0
4 years ago
What is the value of x
attashe74 [19]
The value of X in this question is 46                 
4 0
3 years ago
Read 2 more answers
2(x-4) + 3x-x² for x = 3.
finlep [7]

Answer:

-2

Step-by-step explanation:

2(3-4) +3(3)-3^2\\= 2(-1) + 3(3) -3^2\\= -2 + 9 - 9\\= -2

8 0
2 years ago
Solve the problem.
madreJ [45]

Answer:

9676

Step-by-step explanation:

29028 feet / 3 weeks = 9676 feet per week

6 0
3 years ago
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