Extended data:
The analysis method is as follows: the third column (the content in the red box), the numbers in each small column are marked with letters, the first column is marked with "A", the second column is marked with "B", the third column is marked with "C", and so on; Post-bid analysis: the difference between different letters is significant, but the difference between the same letters is not significant. As far as the above figure is concerned, the difference between sample 1 and samples 2, 3 and 4 is significant, while the difference between sample 2 and sample 1 and 4 is significant, but not significant with sample 3. The difference between sample 4 and 1, 2, 3 is significant.
The analysis result given by the landlord: after bidding, it is like this. Sample 2(a), sample 1 and 3(ab), sample 4(b), sample 2 and sample 1 and 3 (in the same column, all with the letter a) have no significant difference, and sample 4 and sample 1 and 3 have no significant difference (in the same column, all with the letter a).