The reliability of data source is the accuracy of and completenessof computer processed data, given the uses they are intened for
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The reliability of pie charts in a newspaper depends on the reliability of the data sources. If the sources of data are correct and the graph is constructed correctly, then the pie chart is reliable.
The fact that the data is qualitative or quantitative does not in and of itself have anything to do with its reliability.
An inherent problem in using secondary sources of data is that the data may have been skewed or manipulated a bit. Primary sources of data are always more reliable than secondary sources.
relevance, consistency, method of collection used, validity, reasons for which the data were collected, reliability, completenes e.t.c
Data is another term for information. Data can be gathered from experiments, research, and other types of interactions, depending on what the data is for.