Aperiod of time against which costs of the market basket in other periods will be compared in computing a price index is called

Base period

Explanation:

The formula to compute the price index is shown below:

Price index = (Market price in a given year) ÷ (Price at the base period) × 100

Based on the market cost for the given period for computing the price index, the base period price is also needed without which the computation cannot be done. The formula is shown above.

The base period is generally used for comparison so that proper analyzes could be made

answer; according to the ( irs );

answer: a. the kind of population living in your neighbourhood.

the census explorer data tool by the us census bureau allows the user to zoom in on any neighbourhood within the united states and find the kind of people residing in that by race and age.  

the tool needs to needs to be used twice – once in order to find what type of people reside in a neighbourhood, and then to see the age groups of the people in the same neighbourhood.