CALCULATING THE VARIANCE AND STANDARD DEVIATION OF GROUPED AND UNGROUPED DATA

Assoc. Prof. Ogidi, R.C is the Centre Manager and a facilitator of National Teachers Institute, Rumueme, Port Harcourt Study Centre. He is currently a Lecturer at Ignatius Ajuru University of Education, Rumuolumeni, Department of Educational Psychology/Guidance and Counselling.

He has co-authored and authored several books of note, which include: Inferential Statistics (Learners Approach), Descriptive Statistics (Learners Approach).

He is a versatile educationist and Measurement and Evaluation specialist.