(i) Define the term “class size (width)” used in a grouped frequency distribution.
(ii) When a histogram is drawn with a class width that is much larger than necessary, what effect does this have on the appearance and interpretation of the distribution? Explain briefly.
(iii) When a histogram is drawn with a class width that is too small, what difficulties may arise for interpretation? Explain briefly.
(iv) A teacher has a set of 50 test scores ranging from 12 to 97. Suggest a suitable class width for constructing a grouped frequency table and justify your choice.