Multi-choice 9 Question 1. Which of the following is correct? Answers Option 1 r ≥ 1 Option 2 – 1 ≤ r ≤ 0 Option 3 r ≤ 1 Option 4 0 ≤ I r I ≤ 1 Feedback Wrong choice Incorrect option Wrong choice Correct option Solution Wrong (Feedback) Wrong (Feedback) Wrong (Feedback) Correct Option (Feedback) Question 2. Which of the following statements is/are not correct ? Correlation coefficient is always positive Scatter diagram helps in determining the degree of correlation If r = + 1 or – 1, the correlation will be perfect. Correlation coefficient is a relative measure. Answers Option 1 II, III and VI Option 2 II and III Option 3 I, II and III Option 4 I and II Only Feedback Wrong choice Incorrect option Wrong choice Correct option Solution Wrong (Feedback) Wrong (Feedback) Wrong (Feedback) Correct Option (Feedback) Question 3. Which of the following is/are correct? Correlation coefficient is a relative measure. -1 < r < 1 If r = + or – 1, the correlation will be perfect. Correlation coefficient measures only the degree of linear relationship. Answers Option 1 I and II only Option 2 II and III Only Option 3 I , II and III only Option 4 All the four Feedback Wrong choice Incorrect option Wrong choice Correct option Solution Wrong (Feedback) Wrong (Feedback) Wrong (Feedback) Correct Option (Feedback) Question 4. Which of the following is/are correct ? Negative correlation means that both the variables have decreasing values. Positive correlation means that both the variables have increasing values. If the direction of change in the two variables in the same, the two variables will be positively correlated. If the change in the two variables is in opposite direction, the correlation will be negative. Answers Option 1 II and IV Option 2 All the four Option 3 I and II only Option 4 III and IV Only Feedback Wrong choice Incorrect option Wrong choice Correct option Solution Wrong (Feedback) Wrong (Feedback) Wrong (Feedback) Correct Option (Feedback) Question 5. Which of the following is an example of positive and perfect correlation ? Answers Option 1 X + Y = 20 Option 2 X – Y = 20 Option 3 2x + 3y= 25 Option 4 None of the above Feedback Wrong choice Correct option Incorrect option Wrong choice Solution Wrong (Feedback) Correct Option (Feedback) Wrong (Feedback) Wrong (Feedback) Question 6. Which of the following is an example of negatives and perfect correlation ? Answers Option 1 X + Y = 20 Option 2 X – Y = 20 Option 3 3x + 2y = 20 Option 4 None of the above Feedback Correct option Wrong choice Incorrect option Wrong choice Solution Correct Option (Feedback) Wrong (Feedback) Wrong (Feedback) Wrong (Feedback) Question 7. If x = y + 2, then – Answers Option 1 r = – 2 Option 2 r = – 1 Option 3 r = 0.5 Option 4 r = + 1 Feedback Wrong choice Incorrect option Wrong choice Correct option Solution Wrong (Feedback) Wrong (Feedback) Wrong (Feedback) Correct Option (Feedback) Question 8. Which of the following is/are correct ? If x = 2y, x and y will be perfectly correlated. If x = 30 – y, there will be a perfect negative correlation between x and y If x = y + 2, r = + 1 R = 0 means absence of correlation. Answers Option 1 I and II Only Option 2 II and IV Only Option 3 I , II and IV Option 4 All the four Feedback Wrong choice Incorrect option Wrong choice Correct option Solution Wrong (Feedback) Wrong (Feedback) Wrong (Feedback) Correct Option (Feedback) Question 9. Which of the following statements is true ? Answers Option 1 Correlation coefficient is independent of change in origin and scale Option 2 The correlation coefficient increases with the number of paired observations Option 3 If SD2 = 0, the rank correlation = 1 and if ΣD2 = 1, the rank correlation = 0 Option 4 Coefficient of correlation between height and weight is 1.4 Feedback Correct option Wrong choice Incorrect option Wrong choice Solution Correct Option (Feedback) Wrong (Feedback) Wrong (Feedback) Wrong (Feedback) Question 10. Which of the following is correct ? Answers Option 1 Rank correlation can be computed only for quantitative data Option 2 The coefficient of correlation has the same unit as the Pearson’s r Option 3 The coefficient of correlation can be calculated only if both the variables are in the same unit Option 4 The correlation between the age of applicants for life insurance and premium of insurance is positive Feedback Wrong choice Incorrect option Wrong choice Correct option Solution Wrong (Feedback) Wrong (Feedback) Wrong (Feedback) Correct Option (Feedback)
Multi-choice 9 Question 1. Which of the following is correct? Answers Option 1 r ≥ 1 Option 2 – 1 ≤ r ≤ 0 Option 3 r ≤ 1 Option 4 0 ≤ I r I ≤ 1 Feedback Wrong choice Incorrect option Wrong choice Correct option Solution Wrong (Feedback) Wrong (Feedback) Wrong (Feedback) Correct Option (Feedback) Question 2. Which of the following statements is/are not correct ? Correlation coefficient is always positive Scatter diagram helps in determining the degree of correlation If r = + 1 or – 1, the correlation will be perfect. Correlation coefficient is a relative measure. Answers Option 1 II, III and VI Option 2 II and III Option 3 I, II and III Option 4 I and II Only Feedback Wrong choice Incorrect option Wrong choice Correct option Solution Wrong (Feedback) Wrong (Feedback) Wrong (Feedback) Correct Option (Feedback) Question 3. Which of the following is/are correct? Correlation coefficient is a relative measure. -1 < r < 1 If r = + or – 1, the correlation will be perfect. Correlation coefficient measures only the degree of linear relationship. Answers Option 1 I and II only Option 2 II and III Only Option 3 I , II and III only Option 4 All the four Feedback Wrong choice Incorrect option Wrong choice Correct option Solution Wrong (Feedback) Wrong (Feedback) Wrong (Feedback) Correct Option (Feedback) Question 4. Which of the following is/are correct ? Negative correlation means that both the variables have decreasing values. Positive correlation means that both the variables have increasing values. If the direction of change in the two variables in the same, the two variables will be positively correlated. If the change in the two variables is in opposite direction, the correlation will be negative. Answers Option 1 II and IV Option 2 All the four Option 3 I and II only Option 4 III and IV Only Feedback Wrong choice Incorrect option Wrong choice Correct option Solution Wrong (Feedback) Wrong (Feedback) Wrong (Feedback) Correct Option (Feedback) Question 5. Which of the following is an example of positive and perfect correlation ? Answers Option 1 X + Y = 20 Option 2 X – Y = 20 Option 3 2x + 3y= 25 Option 4 None of the above Feedback Wrong choice Correct option Incorrect option Wrong choice Solution Wrong (Feedback) Correct Option (Feedback) Wrong (Feedback) Wrong (Feedback) Question 6. Which of the following is an example of negatives and perfect correlation ? Answers Option 1 X + Y = 20 Option 2 X – Y = 20 Option 3 3x + 2y = 20 Option 4 None of the above Feedback Correct option Wrong choice Incorrect option Wrong choice Solution Correct Option (Feedback) Wrong (Feedback) Wrong (Feedback) Wrong (Feedback) Question 7. If x = y + 2, then – Answers Option 1 r = – 2 Option 2 r = – 1 Option 3 r = 0.5 Option 4 r = + 1 Feedback Wrong choice Incorrect option Wrong choice Correct option Solution Wrong (Feedback) Wrong (Feedback) Wrong (Feedback) Correct Option (Feedback) Question 8. Which of the following is/are correct ? If x = 2y, x and y will be perfectly correlated. If x = 30 – y, there will be a perfect negative correlation between x and y If x = y + 2, r = + 1 R = 0 means absence of correlation. Answers Option 1 I and II Only Option 2 II and IV Only Option 3 I , II and IV Option 4 All the four Feedback Wrong choice Incorrect option Wrong choice Correct option Solution Wrong (Feedback) Wrong (Feedback) Wrong (Feedback) Correct Option (Feedback) Question 9. Which of the following statements is true ? Answers Option 1 Correlation coefficient is independent of change in origin and scale Option 2 The correlation coefficient increases with the number of paired observations Option 3 If SD2 = 0, the rank correlation = 1 and if ΣD2 = 1, the rank correlation = 0 Option 4 Coefficient of correlation between height and weight is 1.4 Feedback Correct option Wrong choice Incorrect option Wrong choice Solution Correct Option (Feedback) Wrong (Feedback) Wrong (Feedback) Wrong (Feedback) Question 10. Which of the following is correct ? Answers Option 1 Rank correlation can be computed only for quantitative data Option 2 The coefficient of correlation has the same unit as the Pearson’s r Option 3 The coefficient of correlation can be calculated only if both the variables are in the same unit Option 4 The correlation between the age of applicants for life insurance and premium of insurance is positive Feedback Wrong choice Incorrect option Wrong choice Correct option Solution Wrong (Feedback) Wrong (Feedback) Wrong (Feedback) Correct Option (Feedback)
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