Equation for the slope of regression line is …………………………

• A) $$b = \frac{{n\sum xy}}{{n\sum {x^2}}}$$
• B) $$b = \frac{{n\sum xy - (\sum x)(\sum y)}}{{n\sum {x^2} - {{(\sum x)}^2}}}$$
• C) $$b = \frac{{n\sum xy + (\sum x)(\sum y)}}{{n\sum {x^2} + {{(\sum x)}^2}}}$$
• D) $$b = \frac{{(\sum x)(\sum y)}}{{{{(\sum x)}^2}}}$$

If y = 2+0.6x, then the slope of line will be . . . . . .

• A) 0.6
• B) y
• C) x
• D) 2

If the value of r is zero then the graph of the data points shows

• A) evenly skewness
• B) positively scattered
• C) no associations
• D) negative associations

When there is no linear correlation between two variables, what will the value of r be?

• A) -1
• B) 0
• C) +1
• D) a very small negative number

The mean number of apples in each carton is 25. What is total number of apples in 10 cartons?

• A) 25
• B) 2.5
• C) 250
• D) 5

Plot scatter diagram helps us in finding the relationship b/w

• A) Constant & a variable
• B) Two variables
• C) Median & Mode
• D) Three variables

The population standard deviation is denoted by.

• A) $\sigma^2$
• B) $s$
• C) $\sigma$
• D) $\mu$

In the scatter diagram, clustering of points around a straight line indicates

• A) non-linear regression
• B) none of these
• C) linear regression
• D) curvilinear regression

Which type of plot is used to identify the relationship between dependent and independent variables.

• A) Histogram
• B) Scatterplot
• C) Bar plot
• D) Line plot

If the regression equation is equal to 23.6 - 54.2X, then 23.6 is the _________ while -54.2 is the ________ of the regression line

• A) slope, regression coefficient
• B) slope, intercept
• C) radius, intercept
• D) intercept, slope

If the estimating equation is Y = a – b X ,Which of the following is true

• A) c) There is inverse relationship
• B) b) Slope of line is negative
• C) a)The y intercept is’b’
• D) d) b & c

The vertical distance divided by the horizontal distance between any two points on the line is said to be

• A) x-intercept
• B) slope
• C) tangent
• D) y-intercept

Regression line always passes through

• A) Mean of data
• B) None
• C) Median of data
• D) Both i. & ii.

If there is a indirect relationship between rainfall & yield of crops then

• A) Yield is higher if rainfall is higher
• B) Yield is lower if rainfall is less
• C) Yield is equal to rainfall
• D) Yield is higher if rainfall is less

In what range does correlation coefficient lie?

• A) -1 to 0
• B) 0 to +1
• C) greater than 1
• D) -1 to +1

What does it mean if the correlation coefficient is close to zero?

• A) Strong positive correlation
• B) No relationship between variables
• C) Perfect negative correlation
• D) Perfect positive correlation

If the correlation coefficient is 0, what does it imply about the relationship between two variables?

• A) Non-linear relationship
• B) Perfect positive relationship
• C) Perfect negative relationship
• D) No relationship

The value of the correlation coefficient lies in

• A) (-1,1)
• B) [0,1]
• C) [-1,1]
• D) [-1,0]

If the standard deviation is small, then many data points will be --------------.

• A) Far away from the mean
• B) Vanished.
• C) Very close to the mean
• D) On the mean point

The coefficient of variation (CV) of a data A is equal to $-0.54$ while data B is equal to $0.32$. Which dataset is considered to be more consistent?

• A) can’t conclude
• B) Data B
• C) CV cannot be negative
• D) Data A