Saturday

August 2, 2014

August 2, 2014

Posted by **Jen** on Friday, October 21, 2011 at 2:59pm.

x y

1 1/2

2 1

3 3/2

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?

- Math -
**MathMate**, Friday, October 21, 2011 at 3:39pmTake

m1=(y(2)-y(1))/(2-1)=0.5

m2=(y(3)-y(2))/(3-2)=0.5

Since the slopes between any of the three points equal 0.5, so the first three points are collinear, and m1=m2>0 so the slope is positive.

Can you take it from here?

- Math -
**Jen**, Friday, October 21, 2011 at 4:08pmThis is so confusing to me :( what would i do next??

- Math -
**MathMate**, Friday, October 21, 2011 at 6:03pmIf you wish, you can calculate the coefficient of correlation according to the method you use at school (mayer, median/median, etc.) using the first three pairs of data.

In the given case, the coefficient of correlation should be 1.0 because the first three points are collinear (fall on a straight line). The slope is positive (0.5), so the answer to the fourth question is positive.

I will let you calculate the coefficient of correlation (and confirm that it is 1.0).

**Related Questions**

stastics- correlation and regression - for the table that follows: answer the ...

Math - For the table that follows, answer the following questions: x y 1 -8 2 -...

statistics - . For the table that follows, answer the following questions: x y 1...

Algebra - 2. Find the value of x^3 +2x^2 -3 when x =3 Answer-42 12. What type of...

Math - Use the following table to answer questions. x y 1 7 3 ? ? 11 7 13 ? ? ...

STAT - Calculate SP (the sum of products of deviations) for the following scores...

STATS - X 3, 5, 6, 8, 9, 10, 12, 14, 15 Y 30,33,34,36,37,40, 50, 60, 70 ...

Finance - Using the data in the following table, estimate (a) he average return ...

Math - Use the function tables to solve the problems. Table :2 Input ( Number of...

Math help - Consider the following table and use the formulas that are given for...