define index number

1.	define index number
Answer» An index number is a statistical device for measuring changes in the magnitude of a group of related variables.Features of Index Number\tIndex numbers are expressed in terms of percentages. However, percentage sign (%) is never used.\tIndex numbers are relative measurement of group of data.\tIndex numbers offer a precise measurement of the quantitative change in the concerned variables over time.\tIndex number show changes in terms of averages.\tThey are expressed in numbers.\tIndex number facilitates the comparative study over different\xa0time period.

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