A common error is neglecting to get ranked data for some statistical processes. Why do we have to have ranked data? Give an example of where you would need ranked data.

Having ranked data assists in finding the median of the group of data.
This median assists in helping to find the middle amount and therefore
can assist in finding a possible equality within that data format.

An
example of this is when the government looks at the amount people are
earning during a said amount of time to assist in finding the average
amount of income to figure what lower class income would be considered.
This is necessary for the government to figure out what the amount of
financial services is necessary for a person to live on. This helps as
far as figuring out an amount of grant to give to public assistance
recipients.