Find the coefficient of correlation from the following data: x 2 3 5 7 3 y 15 17 4 5 4

Given that, the data is x 2 3 5 7 3 y 15 17 4 5 4 We know that, correlation coefficient r = ∑ x i - x ¯ y i - y ¯ ∑ x i - x ¯ 2 ∑ y i - y ¯ 2 ⇒ Mean of x values is x ¯ = 2 + 3 + 5 + 7 + 3 5 = 4 ⇒ Mean of y values is y ¯ = 15 + 17 + 4 + 5 + 4 5 = 9 x y x i - x ¯ y i - y ¯ x i - x ¯ 2 y i - y ¯ 2 x i - x ¯ y i - y ¯ 2 15 - 2 6 4 36 - 12 3 17 - 1 8 1 64 - 8 5 4 1 - 5 1 25 - 5 7 5 3 - 4 9 16 - 12 3 4 0 - 5 0 25 0 Σ x = 20 Σ y = 45 Σ x i - x ¯ = 1 Σ y i - y ¯ = 0 Σ x i - x ¯ 2 = 15 Σ y i - y ¯ 2 = 166 Σ x i - x ¯ y i - y ¯ = - 37 ⇒ r = - 37 15 166 = - 0 . 74

EASY

Earn 100

Explain Perfect Negative Correlation. Draw a scatter plot for Perfect Negative Correlation.

Important Questions on Scatter Diagrams and Correlation

EASY

Mathematics>Statistics and Probability>Scatter Diagrams and Correlation>Correlation

Find the coefficient of correlation from the following data:

$x$	$2$	$3$	$5$	$7$	$3$
$y$	$15$	$17$	$4$	$5$	$4$

MEDIUM

Mathematics>Statistics and Probability>Scatter Diagrams and Correlation>Correlation

Which of the following is spurious correlation?

EASY

Mathematics>Statistics and Probability>Scatter Diagrams and Correlation>Correlation

Find the coefficient of correlation from the regression lines:

x - 2 y + 3 = 0 and 4 x - 5 y + 1 = 0

EASY

Mathematics>Statistics and Probability>Scatter Diagrams and Correlation>Correlation

Prove that : Value of correlation coefficient

r

lies between

- 1 to + 1

EASY

Mathematics>Statistics and Probability>Scatter Diagrams and Correlation>Correlation

The Covariance between two variables is

MEDIUM

Mathematics>Statistics and Probability>Scatter Diagrams and Correlation>Correlation

If scatter diagram from a line move from lower left to upper right corner then the correlation is______.

MEDIUM

Mathematics>Statistics and Probability>Scatter Diagrams and Correlation>Correlation

If the equation of the two regression lines are

2 x - 3 y = 0

and

4 y - 5 x = 8

then the correlation coefficient between

x

and

y

is equal to______.

EASY

Mathematics>Statistics and Probability>Scatter Diagrams and Correlation>Correlation

If the correlation coefficient between

x

and

y

0.5

then Find the correlation coefficient between

2 x - 3

and

3 - 5 y

is:

MEDIUM

Mathematics>Statistics and Probability>Scatter Diagrams and Correlation>Correlation

Y = 9 X

and

X = 0.01 Y

, then

r

is equal to:

MEDIUM

Mathematics>Statistics and Probability>Scatter Diagrams and Correlation>Correlation

Find correlation coefficient:

$X$	$5$	$4$	$3$	$2$	$1$
$Y$	$1$	$2$	$3$	$4$	$5$

EASY

Mathematics>Statistics and Probability>Scatter Diagrams and Correlation>Correlation

Scatter diagram does not help us to

MEDIUM

Mathematics>Statistics and Probability>Scatter Diagrams and Correlation>Correlation

Consider to regression line

3 x + 2 y = 26, 6 x + y = 31

. Find the correlation coefficient between

x

and

y

EASY

Mathematics>Statistics and Probability>Scatter Diagrams and Correlation>Correlation

Determine the value of correlation coefficient for the scatter diagram given below.

Question Image

EASY

Mathematics>Statistics and Probability>Scatter Diagrams and Correlation>Correlation

The type of correlation existing between the variables in the graph is

Question Image

EASY

Mathematics>Statistics and Probability>Scatter Diagrams and Correlation>Correlation

Define extrapolation and then determine the value of $y$ at $x = 5$ on the straight line using a linear extrapolation method if the two given points that lie on the straight line is $(1, 5)$ and $(4, 10)$ .