It would be difficult to extrapolate data from a dot plot graph because dot plots are primarily used for displaying and comparing individual data points, rather than showing trends or patterns in the data. Since dot plots do not typically include lines or curves to connect the data points, it can be challenging to accurately estimate values between the plotted points or beyond the range of the data provided. Additionally, dot plots are not designed for precise numerical analysis or prediction, making it unreliable for extrapolating data.
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A scatter chart would be the best candidate to spot trends and extrapolate information based on research data.
That will depend on the type of data and what you are looking for. You could use a line chart but even a bar chart or a scatter graph. ----------- If these are time series data, and assuming that you have sufficient data, I would suggest calculating spectra as a way of identifying possible trends.
what incrament would ba a apppropriate to make a graph of the data
A Bar Graph
A scatter plot would be best for non-related data points. A line graph would be best for related data points.