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What is secondary data used for?
Secondary data has already been collected by and readily available from other sources. It is cheaper and easier to obtain than primary data. It helps provide an understanding of the problem and allows for comparison of the primary data collected. Secondary data can also be used as study to determine if and where mistakes or deficiencies exist in either set of data.
What are the three criteria for parametric test to be used?
normal distiribution n>30 numeratical data
What are the different between primary data and secondary data?
Primary data is data which has been collected by yourself, which is more reliable and up to date. Secondary data has been collected from a secondary source (Other people, business etc.) so it may not be valid or up to date."Primary" and "secondary" are terms used to define data relative to the purpose by which the data were collected originally."Primary data" are data collected for the need at hand."Secondary data" are data that were collected for another reason but is being re-purposed to address the need at hand.When describing the expertise of data analysts, it is not uncommon to distinguish between primary and secondary data analytics. Primary data analytics involves the ability to analyze data for the purpose by which it has been collected. Secondary data analytics involves identifying "secondary data sources" to solve a new problem and then the ability to re-purpose that data.Primary data is a data which is created for the first time and there is no previous source available. Secondary data is a readily available data like data from trade directories,statistics from websites etc. In Dissertation Literature review is done through secondary data which includes the contents such as theories, models, compilation, research findings by some other scholar etc.
What is stacked data In Statistics?
Stacked data is a term which is used for a particular form of bar charts. For data classified into classes, a bar chart would comprise a set of bars, one for each class, where the height of the bar represents the variable of interest. If the data are classified according according to two criteria, one way to display the data is to use a stacked bar chart where each bar represents the classes, and, stacked on top of one another, are bars representing the secondary classes.
What is the difference between primary and secondary sources of reading and primary and secondary sources of data?
I've never heard of primary vs. secondary sources ofreading, but I can provide an answer on primary vs. secondary sources of data.A secondary source of data is data that was collected for a reason other than the task at hand. A good example is US Census data. Marketers might use census data as input into decisions. An example of application of this data is as follows. Suppose you want to distribute your product in the 5 most populated cities in the US. You could find this info from census data, and go about distributing your product in those 5 cities.A primary source of data is data that is collected specifically for the task at hand, often via a market research study. For example, if you wanted to know what features of your product are most valued to buyers, you would design a market research study (i.e. questionnaire) to find that out. At the end of your study, you'd have the data to answer your question.---Note that there is quite a trade in used data. There's nothing wrong in this, provided all the relevant information about things like the purpose and reliability and possible sources of distortion of the old data are taken into account.
