[Retracted] Application Research and Analysis of Intelligent Sensors in Tennis Serving Technical Correction Equipment

Table 3

Average serve height of subjects.

		Maximum height of the ball from the hand (m)	Height of hitting point (m)
Test group		1.81	2.76
	Max	1.92	2.87
	Min	1.65	2.43
Control group		1.68	2.57
	Max	1.76	2.62
	Min	1.59	2.29
Professional athlete		2.01	3.12
	Max	2.34	3.54
	Min	1.89	2.77