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Table 1 Data of a repeated language-test after a special training (Example 1).

From: Regression toward the mean – a detection method for unknown population mean based on Mee and Chua's algorithm

Student Before After
1 45 49
2 52 50
3 63 70
4 68 71
5 57 53
6 55 61
7 60 62
8 59 67