Several employees have submitted different methods of assemb

Several employees have submitted different methods of assembling a subassembly. Sample data for each method are:

How many treatments are there?

	Minutes Required for Assembly
Sample Number	Lind\'s Method	Szabo\'s Method	Carl\'s Method	Manley\'s Method
1	19.9	16.2	25.0	18.6
2	15.1	21.0	24.0	24.8
3	23.7	24.8	23.4	25.3