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Do you need a data file to make a bar graph?
No but you do need a dataset or data range with which to to populate the graph.
Does the data support the hypothesis?
You would need to tell us about the data, the hypothesis and so on for us to be able to answer.
What does tabulating mean?
There are a few meanings of the word tabulate, the most common ones are:To put into tabular formTo count, record or list systematically
Why measures of dispersion are important along with measures of central tendency to understand the nature of the data?
Central tendency will only give you information on the location of the data. You also need dispersion to define the spread of the data. In addition, shape should also be part of the defining criteria of data. So, you need: location, spread & shape as best measures to define data.
What did you mean by data representation explain it briefly?
Data is information that is interpreted by a collection (Representation) of explanatory words or symbols. A simple explanation is a 60mph sign at the side of the road. The figure 60 is the data while the sign embossed with 60 is the representation informing you of that which you need to know. Traffic lights are a representation that tells you by the data of different colours what you you need to know. @ is a representation of the data "at"
