[size=150]2 Explore class interval by adjusting the slider [b]Class Interval Width [/b]below right of histogram[br] For each class interval width, change the [b]Month of the Year[/b] slider and observe the[br] number of rainy days for each month from January to December. [br][br] (a) What do you observe when the class intervals are small?[br] (b) What do you observe when the class intervals are big?[/size]
[size=150](a) Frequencies become smaller (height is become shorter) [br] Gaps (zero frequencies in some class intervals may occur). [br] The shape of the histograms will change when class intervals are smaller.[br] There are more "jagged" bars and varying heights.[br](b) Frequencies become larger (height is become taller) [br] Gaps disappear(no zero frequencies in class intervals). [br] The shape of the histograms will change, with fewer bars.[/size][br]