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- anonymous

For the table that follows, answer the following questions: x y 1 -1 2 -5 3 -9 4 - Would the correlation between x and y in the table above be positive or negative? - Find the missing value of y in the table. - How would the values of this table be interpreted in terms of linear regression? - If a “line of best fit” is placed among these points plotted on a coordinate system, would the slope of this line be positive or negative?

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- anonymous

- katieb

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- anonymous

Can u help me out?

- anonymous

i can attempt to but idk if i'll be right lol

- anonymous

the missing value is -13 i think

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- anonymous

thats all that matters at the moment been working on this test for the past 9 hours and have had trouble with 4 problems

- anonymous

i think the correlation is negative but idk for sure

- anonymous

|dw:1354422222993:dw| This is the table kinda looks like

- anonymous

the slope of the line of best fit would be negative too i think

- anonymous

|dw:1354422393361:dw|

- anonymous

|dw:1354422478255:dw|

- anonymous

|dw:1354422618536:dw|

- anonymous

Sorry Mahmit can you type that it is hard to read the drawing of what your saying I can read some of it but not the words themselves

- anonymous

|dw:1354423129456:dw|

- anonymous

|dw:1354423246667:dw|

- anonymous

right it is asking for the last number in the table

- anonymous

which would be -13 correct?

- anonymous

?

- anonymous

Jim what is he saying?

- jim_thompson5910

idk why you're going through all this trouble with regression when all points lie on the same line...namely y = -4x + 3
How did I get this?
As you increase x, y is decreasing by 4 each time. So the slope is -4/1 = -4
So
y = mx + b
y = -4x + b
-1 = -4(1) + b
-1 = -4 + b
-1 + 4 = b
3 = b
b = 3
So the equation of the line is y = -4x + 3
You can check this by plugging in x = 1 to get
y = -4x + 3
y = -4(1) + 3
y = -4 + 3
y = -1
So when x = 1, y is y = -1
Now plug in x = 2 to get
y = -4x + 3
y = -4(2) + 3
y = -8 + 3
y = -5
So when x = 2, y is y = -5
Finally, plug in x = 3 to get
y = -4x + 3
y = -4(3) + 3
y = -12 + 3
y = -9
So when x = 3, y is y = -9

- jim_thompson5910

When x = 4, y is...
y = -4x + 3
y = -4(4) + 3
y = -16 + 3
y = -13
So when x = 4, y is y = -13

- anonymous

Thank you jim I have been on this stupid problem for over 4 hours trying to figure out the equation to use for it. Thank you so much

- jim_thompson5910

yw

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