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Showing 49 of 49 questions

In context with correlation, what do you call the graph, if the points of paired observations $(x,y)$ are shown in a graph?

Q21m

What is the value of $r$ , if all the points plotted in a scatter diagram lie on a single line only?

Q31m

What is the range of the correlation coefficient $r$ ?

Q41m

The measurement unit of a variable 'Weight' is kg. and that of 'Height' is cm. What can you say about the measurement unit of the correlation coefficient between them?

Q51m

Which kind of the correlation can be obtained if the two variables are varying in opposite direction in constant proportion?

Q61m

What does the numerator indicate in the formula for calculating the correlation coefficient by Karl Perason's method?

Q71m

Which of the following values is not possible as a value of $r$ ?

Q81m

If $u = \frac{x - A}{c_x}$ and $v = \frac{y - B}{c_y}$ , $c_x > 0$ , $c_y > 0$ then which of the following statement is correct?

Q91m

If $r(x, y) = 0.7$ then what is the value of $r(x + 0.2, y + 0.2)$ ?

Q101m

If $r(-x, y) = -0.5$ then what is the value of $r(x, -y)$ ?

Q111m

What is the value of the rank correlation coefficient if $\Sigma d^2 = 0$ ?

Q121m

In the method of rank correlation, in usual notations if $R_{x} = R_{y}$ for each pair of observations then what is the value of the $r$ ?

Q131m

In the method of rank correlation, what is the sum of differences of the ranks of two variables?

Q141m

In the method of rank correlation, if the ranks of two variables are exactly in reverse order then what is the value of $r$ ?

Q151m

In usual notations, which term is added in $\Sigma d^2$ for each repeated observation in the rank correlation?

Q161m

Which kind of correlation will you get between the number of units sold and its revenue at constant price?

Q171m

Define correlation.

Q181m

Define correlation coefficient.

Q191m

The age of an adult person and life insurance premium at the time of taking an insurance under a plan.

Q201m

The sales and profit of last five years for a mostly accepted product of a company.

Q211m

The rate of inflation and the purchase power of common man of a country when income of the common man is stable.

Q221m

Altitude and amount of Oxygen in air.

Q231m

What can be said about the correlation between the annual import of crude oil and the number of marriages during the same time period?

Q241m

The correlation coefficient between $X$ and $Y$ is 0.4. What will be the value of correlation coefficient if 5 is added in each observation of $X$ and 10 is subtracted from each observation of $Y$ ?