Collection of D...

How can statistical data collected?

When data is classified on the basis of attribute it is termed as________.

After doing the thorough calculation of consumer demand by setting up stimulated stores, providing a sample of consumers with money, and then allowing them to purchase and keep the commodities they select in the stores is called the ______________.

Data collected by research institutions is ________________.

Statistical data of estimation should ________________.

Data is_______________.

In order to save time and money, economists may collect their data by __________.

Collected data should be ______________.

The types of error in sample investigation way of collecting of data are ______________.

For checking how many students scored above $$80\%$$ marks in a class what should be the source of data?