The minimum value of the correlation coefficient r can be

• A) -1
• B) -infinity
• C) 1
• D) 0

The coefficient of variation (C.V) shows the dispersion of the standard deviation about the _________.

• A) Observations
• B) Standard Deviation
• C) Mean
• D) Variance

The estimated regression line of Y on X is

• A) iv. None of above
• B) Y` = a - bX
• C) X` = a + bY
• D) Y` = a + bX

What does the term "outlier" mean in the context of a scatter plot with regression analysis?

• A) The intercept of the regression line
• B) The slope of the regression line
• C) A data point that deviates significantly from the overall pattern
• D) A data point that lies close to the regression line

If actual value =152 and trend=187 then the seasonal variation will be equal to __________.

• A) -35
• B) 187
• C) 35
• D) 339

If y = 2+0.6x, then the value of y-intercept will be . . . . . .

• A) x
• B) 0.6
• C) 2
• D) y

We use ………………. to represent relationship between two variables by fitting a linear equation to observed data.

• A) Linear regression
• B) Correlation
• C) Covariance
• D) Multiple regression

The graph of a regression line may be

• A) All of these
• B) Quardatic
• C) Cubic
• D) Linear

If a =120 (intercept) and b=2.5 (slop), which of the following equations represents the regression line of Y on X?

• A) Y=2.5+120X
• B) Y=120+2.5X
• C) Y=2.5−120X
• D) Y=120−2.5X

The arithmetic mean of the absolute deviation of the observation from the mean is called

• A) Variance
• B) Mean deviation
• C) Standard Error
• D) Absolute Deviation

If the equation of regression line is y = 6, then which of the following will be true for it.

• A) The line is parallel to y-axis
• B) The line passes through the origin
• C) Slope of the line is equal to 6
• D) The line is parallel to x-axis

For the regression line:Y= a+bX,'a' is the

• A) y-intercept
• B) Slope of the regression line
• C) none of these
• D) x-intercept

Correlation is the standardized form of

• A) Covariance
• B) Standard deviation
• C) Sample correlation
• D) Variance

Random variation can be defined as ___________ .

• A) Actual × expected
• B) None of these.
• C) Actual +expected
• D) Actual –expected

The Marks of mathematics on weekly basis for three months

Period Marks Moving Averages
Month 1 Week 1 70
Week 2 60 ?
Week 3 65 ?
Month 2 Week 1 80 ?
Week 2 82 ?
Week 3 85 ?
Month 3 Week 1 60 ?
Week 2 75 ?
Week 3 80
The Moving Averages will be ------------

• A) 65 70 75.7 82.3 71 72 71.7
• B) 65 71 73 82.3 75.7 73.3 71.7
• C) 65 68.3 75.7 82.3 75.7 73.3 71.7
• D) 65 68.3 70 72 73 73.3 71.7

If the amount of rainfall affects growth of crops. What is the best statistical tool to use to mathematically model this relationship?

• A) Intercept function
• B) Exponential smoothing
• C) Regression analysis
• D) Correlation analysis

In Excel's regression tool, the p-value represents the probability of

• A) obtaining a sample slope as extreme or more extreme than the calculated value, assuming no relationship between the variables.
• B) sample slope is the same as the population slope.
• C) obtaining a sample slope as high as the calculated value.
• D) relationship between the variables is linear.

To determine whether a linear relationship exists, the first step is to develop a

• A) Scatter Diagram.
• B) table of variables.
• C) Histogram.
• D) Sample for Means.

If the value of any regression coefficient is zero, then two variables are

• A) correlated
• B) independent
• C) none of these
• D) dependent

For the least squares regression line y = 0.9 + 1.7x,___ and ___ are slope and intercept respectively.

• A) 0 and 1
• B) 0.9 and 1.7
• C) 1.7 and 0.9
• D) 2.6 and 0