[Retracted] Tennis Technology Recognition and Training Attitude Analysis Based on Artificial Intelligence Sensor

Table 2

The time difference between the throwing and hitting of the students in the control class (unit: second) ().

	Average value at the beginning of teaching	End-of-teaching average
Co	4.48	3.64
CI	4.32	3.72
C2	4.32	3.76
C3	4.04	3.52
C4	4.44	3.44
C5	4.24	3.52
C6	452	3.36
C7	4.00	3.52
C8	3.84	3.24
C9	3.92	3.20