Question

(A) Index numbers are usually applied in statistical device to measure the combined
Reason (R) Index numbers are intended to study the change in the effects of such factors which cannot be measured directly ​

Answer 1

Explanation:

Index numbers are intended to study the change in the effects of such factors which cannot be measured directly. ... In business, different groups of variables in the measurement of which index number techniques are normally used are price, quantity, value, and business activity.