When is rank correlation more precise than simple correlation coefficient?
Q.1. Plot the following data asa a scatter diadram and comment over the result :
X : 1110 15 13 10 16 13 8 17 14
Y : 67 99 7 11 9 6 1211
Q.2. From the following data compute the product moment corralation between x and y .
x series y series
Arithmetic mean 25 18
square of deviations from arithmetic mean136 138
Q.3. Calculate karl pearsons cofficient of corralation on the following data :
x : 1518 21 24 27 3036 39 42 48
y : 25 25 27 27 3133 35 41 4145
Q.4. Calculate correlation cofficient between x, the number of raniy days per month and y , the number of rain coats sold in that month in a certain shop for 12 month . interpret the results .
X : 14 8 18 10 22 9 3 5 6 11 13 13
Y : 15 11 20 12 15 7 3 4 7 10 11 29
Q.5. The deviations from their means of two series (x and y) are given below :
x : -4 -3 -2 -1 0 +1 +2 +3 +4
y : +3 -3 -4 0 +4 +1 +2 -2 -1
Q.6. Find suitable coefficient of correlation for the following data :
Fertilizers used (in tons) : 15 18 20 24 30 35 40 50
Productivity (in tons) : 85 93 95 105 120 130150 160
Does zero correlation mean independence?
Name the methods used to measure correlation and also define them briefly.
When is rank correlation more precise than simple correlation coefficient?
Q.1. Plot the following data asa a scatter diadram and comment over the result :
X : 1110 15 13 10 16 13 8 17 14
Y : 67 99 7 11 9 6 1211
Q.2. From the following data compute the product moment corralation between x and y .
x series y series
Arithmetic mean 25 18
square of deviations from arithmetic mean136 138
Q.3. Calculate karl pearsons cofficient of corralation on the following data :
x : 1518 21 24 27 3036 39 42 48
y : 25 25 27 27 3133 35 41 4145
Q.4. Calculate correlation cofficient between x, the number of raniy days per month and y , the number of rain coats sold in that month in a certain shop for 12 month . interpret the results .
X : 14 8 18 10 22 9 3 5 6 11 13 13
Y : 15 11 20 12 15 7 3 4 7 10 11 29
Q.5. The deviations from their means of two series (x and y) are given below :
x : -4 -3 -2 -1 0 +1 +2 +3 +4
y : +3 -3 -4 0 +4 +1 +2 -2 -1
Q.6. Find suitable coefficient of correlation for the following data :
Fertilizers used (in tons) : 15 18 20 24 30 35 40 50
Productivity (in tons) : 85 93 95 105 120 130150 160
Does zero correlation mean independence?
Name the methods used to measure correlation and also define them briefly.