EASY

Earn 100

Define lurking variable with example.

Important Questions on Bivariate Data

HARD

Mathematics>Statistics and Probability>Bivariate Data>Analysis of Bivariate Data

n = 10, \sum x = 26, \sum y = - 27, \sum x^{2} = 226, \sum y^{2} = 267, \sum x y = 7,

find correlation coefficient.

EASY

Mathematics>Statistics and Probability>Bivariate Data>Analysis of Bivariate Data

What are the types of simple correlation?

EASY

Mathematics>Statistics and Probability>Bivariate Data>Analysis of Bivariate Data

Explain different types of correlation.

MEDIUM

Mathematics>Statistics and Probability>Bivariate Data>Analysis of Bivariate Data

The coefficient of correlation between two variables $X$ and $Y$ is $0.64$ . Their covariance is $16$ . The variance of $X$ is $9$ . Find the standard deviation of $Y -$ series.

EASY

Mathematics>Statistics and Probability>Bivariate Data>Analysis of Bivariate Data

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

EASY

Mathematics>Statistics and Probability>Bivariate Data>Analysis of Bivariate Data

What is the value of ‘

r

’ when two variables are uncorrelated?

HARD

Mathematics>Statistics and Probability>Bivariate Data>Analysis of Bivariate Data

Calculate correlation coefficient from the following results:

N = 10, \sum x = 140, \sum y = 150, \sum (x - 10)^{2} = 180, \sum (y - 15)^{2} = 215, \sum (x - 10) (y - 15) = 60 .

EASY

Mathematics>Statistics and Probability>Bivariate Data>Analysis of Bivariate Data

r = + 1

, then the correlation is called

EASY

Mathematics>Statistics and Probability>Bivariate Data>Analysis of Bivariate Data

The correlation coefficient of

x

and

y

is symmetric. Hence

EASY

Mathematics>Statistics and Probability>Bivariate Data>Analysis of Bivariate Data

Give an example for negative correlation

MEDIUM

Mathematics>Statistics and Probability>Bivariate Data>Analysis of Bivariate Data

Find

ρ (x, y)

cov (x, y) = - 16.5, var (x) = 2.25

and

var (y) = 144

EASY

Mathematics>Statistics and Probability>Bivariate Data>Analysis of Bivariate Data

What you understand by spurious correlation?

EASY

Mathematics>Statistics and Probability>Bivariate Data>Analysis of Bivariate Data

When the correlation coefficient is +1, state your interpretation.

HARD

Mathematics>Statistics and Probability>Bivariate Data>Analysis of Bivariate Data

Find the covariance and the coefficient of correlation between

x

and

y

when

n = 10, \sum x = 60, \sum y = 60, \sum x^{2} = 400, \sum y^{2} = 580

and

\sum x y = 305

EASY

Mathematics>Statistics and Probability>Bivariate Data>Analysis of Bivariate Data

How do you interpret the coefficient of correlation which lies between

0

and

+ 1

EASY

Mathematics>Statistics and Probability>Bivariate Data>Analysis of Bivariate Data

What are the different types of correlation?

EASY

Mathematics>Statistics and Probability>Bivariate Data>Analysis of Bivariate Data

If all the plotted points lie on a straight line falling from upper left hand corner to lower right hand corner then it is called

EASY

Mathematics>Statistics and Probability>Bivariate Data>Analysis of Bivariate Data

Give an example for positive correlation?

EASY

Mathematics>Statistics and Probability>Bivariate Data>Analysis of Bivariate Data

Give an example for no correlation

EASY

Mathematics>Statistics and Probability>Bivariate Data>Analysis of Bivariate Data

What do you mean by uncorrelated?

Define lurking variable with example.

Important Questions on Bivariate Data

Learn and Prepare for any exam you want !