Related InterviewSolutions

• What is spurious correlation ?
• Altitude and amount of Oxygen in air.
• The rate of inflation and the purchase power of common man of a country when income of the common man is stable.
• 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 substracted from each observation of Y ?
• What can be said about the correlation between the annual import of crude oil and the number of marriages during the same time period ?
• If u = \(\frac{x−A}{C_x}\) and v = CX\(\frac{x−A}{C_x}\), Cx > 0, Cy > 0, then which of the following statement is correct?(a) r (x, y) ≠ r (u, v)(b) r (x, y) > r (u, v)(c) r(x, y) = r (u, v)(d) r (x, y) < r(u, v)
• If r(x, y) = 0.7, then what is the value of r (x + 0.2, y+ 0.2)?(a) 0.7(b) 0.9(c) 1.1(d) – 0.7
• If r(-x, y) = – 0.5, then what is the value of r(x, -y)?(a) 0.5(b) – 0.5(c) 1(d) 0
• In context with correlation, what do you call the graph, if the points of paired observations (x, y) are shown in a graph?(a) Histogram(b) Circle diagram(c) Scatter diagram(d) Frequency curve
• The coefficient of rank correlation of the marks obtained by 10 students in two particular subjects was found to be 0.5. Later on, it was found that one of the differences of the ranks of a student was 7 but it was taken as 3. Find the corrected value of the correlation coefficient.