Maths & Statistics Department;
The Polytechnic;
Ibadan;
Nigeria;
Statistics Department;
Ogun State College of Health Technology;
Ijebu Ode;
Nigeria;
Mechanical Engineering Department;
The Polytechnic;
Ibadan;
Nigeria;
Factorial; Design; NPK; Fertilizer; Yellow; Maize; Duncan; Multiple; Range; Test; Quadratic; Regression;