Correlation - Online Test
Q1. If rxy = ryx, correlation between x and y is
Answer : Option A
Explaination / Solution:
When the coefficient of correlation between X and Y (rxy) is equal to the coefficient of correlation between Y and X (ryx), the relationship between X and Y is said to be symmetric.
Q2. The nature of correlation for shoe size and IQ is _________
Answer : Option A
Explaination / Solution:
There is no relationship between the shoe size of a person and his IQ and therefore there is no correlation
Q3.
Calculate Karl Pearson’s coefficient of correlation on the following data:
Answer : Option A
Explaination / Solution:
Q4. Number of pairs of observations of x and y series = 10
X series: Arithmetic average = 65
Standard deviation = 23.33
Y series: Arithmetic average = 66
Standard deviation = 14.9
Summation of products of corresponding deviation of X and Y series = + 2704
Calculate product moment correlation of x and y series.
X series: Arithmetic average = 65
Standard deviation = 23.33
Y series: Arithmetic average = 66
Standard deviation = 14.9
Summation of products of corresponding deviation of X and Y series = + 2704
Calculate product moment correlation of x and y series.
Answer : Option A
Explaination / Solution:
Q5. Calculate Pearson's correlation coefficient from the following data :
Answer : Option C
Explaination / Solution:
Q6.
If then ?
Answer : Option B
Explaination / Solution:
Coefficients of correlation possess the property of symmetry, i.e., rxy=ryx .
Q7. Calculate coefficient of Correlation between price and supply. Interpret the value of correlation coefficient.
Answer : Option C
Explaination / Solution:
Q8. Compute the coefficient of correlation of the following score of A and B
Answer : Option C
Explaination / Solution:
Q9. Rank correlation coefficient r = 0.8., ; Find ‘ n’ .
Answer : Option D
Explaination / Solution:
Q10. Given that r = 0.42, cov(x,y) = 10.5, var(x) = 16; Find the standard deviation of y.
Answer : Option A
Explaination / Solution:
