Stats Tester, Easy statistics

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1. New: [Two-sample proportion test]
2. Updated: [Mann-Whitney U test]
3. [Correlation, Regression, .....]: Renamed to [Pearson correlation coefficient]. In addition, bugs that occurred with the following data were corrected. Example = [(1,1) (2,2) (3,3) (4,4)], etc. Fixed the same bug of [Spearman rank correlation].
4. [Spearman rank correlation coefficient]: Fixed the same bug as [Pearson correlation coefficient].
5. Fixed a bug by which some characters are underlined in red.