A pie chart is never, ever, appropriate for statistical tests. It can be a useful way of illustrating results but it has no usefulness in testing.
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* Always when the assumptions for the specific test (as there are many parametric tests) are fulfilled. * When you want to say something about a statistical parameter.
Bar chart or bar graph
There is none. If an accurate measure was possible then statistical techniques would not be required. A maximum likelihood estimate is probably better than other statistical estimates.
Yes. Statistics and statistical functions would indeed be used in a financial spreadsheet. A lot of financial data is statistical.
A line chart would be the best chart to do that. However, it could also be done with a bar or column chart. You can also add trendlines to them to help show a trend.