An Index number which measure the change of a ________ is called Aggregative 1. No?

There are ________ probability sampling?

Suppose for 40 observations, the variance is 50. If all the observations are increased by 20, the variance of these increased observation will be________?

Correlation coefficient is________?

A contractor employs 20 male, 15 female and 5 children in his factory. Male wages are Rs. 10 per day, female Rs. 8 per day, and children Rs. 3 per day. The weighted x of wages paid per day will be________?

N – n/N -1 is called ________ population?