posted by marilyn .
how to do histogram and relative- frequency histogram using the #s 1,5,5,6,7,4,8,7,6,5,5,6,7,6,6,5,8,9,9, 10,7,8,11,2,4,6,5,12,13,6,3,7,8,8,9,9,10,9,8,9
with five classes
Range = 1-13 giving you 14 different score values
14/5 = 2 4/5, so 3 would seem to be best interval size.
For each score, put an X in the appropriate interval. The number of X's in each interval will determine the height of the bar for that interval for a histogram.
Divided each interval frequency by the N (total number of scores) to get the relative frequency and use those values to determine the height of the vertical bars.