Mathematics: Analysis and Approaches SL>Statistics and Probability>Statistics>Linear Regression

EASY

Earn 100

Explain perfect positive correlation with a scatter plot.

Important Questions on Statistics

MEDIUM

Mathematics: Analysis and Approaches SL>Statistics and Probability>Statistics>Linear Regression

Which of the following is spurious correlation?

MEDIUM

Mathematics: Analysis and Approaches SL>Statistics and Probability>Statistics>Linear Regression

If

Y = 9 X

and

X = 0.01 Y

, then

r

is equal to:

MEDIUM

Mathematics: Analysis and Approaches SL>Statistics and Probability>Statistics>Linear Regression

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

MEDIUM

Mathematics: Analysis and Approaches SL>Statistics and Probability>Statistics>Linear Regression

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______.

MEDIUM

Mathematics: Analysis and Approaches SL>Statistics and Probability>Statistics>Linear Regression

Consider to regression line

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

. Find the correlation coefficient between

x

and

y

:

EASY

Mathematics: Analysis and Approaches SL>Statistics and Probability>Statistics>Linear Regression

The Covariance between two variables is

MEDIUM

Mathematics: Analysis and Approaches SL>Statistics and Probability>Statistics>Linear Regression

Find correlation coefficient:

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

EASY

Mathematics: Analysis and Approaches SL>Statistics and Probability>Statistics>Linear Regression

Find the coefficient of correlation from the following data:

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

EASY

Mathematics: Analysis and Approaches SL>Statistics and Probability>Statistics>Linear Regression

If the correlation coefficient between

x

and

y

is

0.5

then Find the correlation coefficient between

2 x - 3

and

3 - 5 y

is:

EASY

Mathematics: Analysis and Approaches SL>Statistics and Probability>Statistics>Linear Regression

Scatter diagram does not help us to

EASY

Mathematics: Analysis and Approaches SL>Statistics and Probability>Statistics>Linear Regression

Prove that : Value of correlation coefficient

r

lies between

- 1 to + 1

.

EASY

Mathematics: Analysis and Approaches SL>Statistics and Probability>Statistics>Linear Regression

Find the coefficient of correlation from the regression lines:

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

.

EASY

Mathematics: Analysis and Approaches SL>Statistics and Probability>Statistics>Linear Regression

What are the different types of correlation?

EASY

Mathematics: Analysis and Approaches SL>Statistics and Probability>Statistics>Linear Regression

How do you interpret the coefficient of correlation which lies between

0

and

+ 1

?

EASY

Mathematics: Analysis and Approaches SL>Statistics and Probability>Statistics>Linear Regression

The correlation coefficient of

x

and

y

is symmetric. Hence

EASY

Mathematics: Analysis and Approaches SL>Statistics and Probability>Statistics>Linear Regression

Define co-variance.

EASY

Mathematics: Analysis and Approaches SL>Statistics and Probability>Statistics>Linear Regression

If the two variables do not have linear relationship between them then they are said to have

EASY

Mathematics: Analysis and Approaches SL>Statistics and Probability>Statistics>Linear Regression

Explain different types of correlation.

EASY

Mathematics: Analysis and Approaches SL>Statistics and Probability>Statistics>Linear Regression

The height and weight of a group of persons will have _______ correlation.

EASY

Mathematics: Analysis and Approaches SL>Statistics and Probability>Statistics>Linear Regression

What you understand by spurious correlation?