Table 5. Purchase decision of different individual income and multiple comparison LSD difference test.

Individual income	Mean value	Standard error	Mean difference
E1< 3000 yuan	2.871	0.5985
E2 = 3001–5000 yuan	2.915	0.7154
E3 = 5001–7000 yuan	3.078	0.9233
E4> 7001 yuan	3.331	1.1492
E1-E2			-0.0438
E1-E3			-0.2065
E1-E4			-0.4594*
E2-E3			-0.1627
E2-E4			-0.4156*
E3-E4			-0.2529

*The mean difference is significant at the 0.05 level

**the mean difference is significant at the 0.01 level.