Correlation and Regression Quiz | Correlation and Regression Objective Type Questions and Answers

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Questions
21 A measure of the strength of the linear relationship that exists between two variables is called:
A Slope
B Intercept
C Correlation coefficient
D Regression equation

Answer: Correlation coefficient
22 If all the actual and estimated values of Y are same on the regression line, the sum of squares of error will be:
A Zero
B Maximum
C Minimum
D Unknown

Answer: Zero
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23 The sum of the difference between the actual values of Y and its values obtained from the fitted regression line is always:
A Zero
B Positive
C Negative
D Minimum

Answer: Zero
24 The purpose of simple linear regression analysis is to:
A Predict one variable from another variable
B Replace points on a scatter diagram by a straight-line
C Measure the degree to which two variables are linearly associated
D Obtain the expected value of the independent random variable for a given value of the dependent variable

Answer: Predict one variable from another variable
25 Regression coefficient is independent of:
A Units of measurement
B Scale and origin
C Both (a) and (b)
D None of these

Answer: Both (a) and (b)
26 It is possible that two regression coefficients have:
A Opposite signs
B Same signs
C No sign
D Difficult to tell

Answer: Same signs
27 When two regression coefficients bear same algebraic signs, then correlation coefficient is:
A Positive
B Negative
C According to two signs
D Zero

Answer: According to two signs
28 The correlation coefficient is the_______of two regression coefficients:
A Geometric mean
B Arithmetic mean
C Harmonic mean
D Median

Answer: Geometric mean
29 When bXY is positive, then byx will be:
A Negative
B Positive
C Zero
D One

Answer: Positive
30 When regression line passes through the origin, then:
A Intercept is zero
B Regression coefficient is zero
C Correlation is zero
D Association is

Answer: Intercept is zero
31 The graphrepresents the relationship that is.:
A Linear positive
B Linear negative
C Non-linear
D Curvilinear

Answer: Linear negative
32 The graph represents the relationship that is:
A Linear
B Non linear
C Curvilinear
D No relation

Answer: Linear
33 The graph showing the paired points of (Xi, Yi) is called:
A Scatter diagram
B Histogram
C Historigram
D Pie diagram

Answer: Scatter diagram
34 The independent variable in a regression line is:
A Non-random variable
B Random variable
C Qualitative variable
D None of the above

Answer: Non-random variable
35 In the regression equation Y = a +bX, a is called:
A X-intercept
B Y-intercept
C Dependent variable
D None of the above

Answer: Y-intercept
36 In the regression equation X = a + bY, the X is called:
A Independent variable
B Dependent variable
C Qualitative variable
D None of the above

Answer: Dependent variable
37 In the regression equation Y = a+bX, the Y is called:
A Independent variable
B Dependent variable
C Continuous variable
D None of the above

Answer: Dependent variable
38 When the ratio of variations in the related variables is constant, it is called:
A Linear correlation
B Nonlinear correlation
C Positive correlation
D Negative correlation

Answer: Linear correlation
39 If both variables X and Y increase or decrease simultaneously, then the coefficient of correlation will be:
A Positive
B Negative
C Zero
D One

Answer: Positive
40 If the points on the scatter diagram indicate that as one variable increases the other variable tends to decrease the value of r will be:
A Perfect positive
B Perfect negative
C Negative
D Zero

Answer: Negative
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