QMS 102 Chapter Notes - Chapter 3: Frequency (Statistics), Ogive

• School: Ryerson University
• Department: Quantitative Methods
• Course: QMS 102
• Professor: na

Document Summary

Class boundaries (numbers under class column), lower boundary and upper boundary. You cannot finish up a class by writing 25 and over . Class width = upper boundary - lower boundary e. g. , class width = 10-5. If there are decimals, then the numbers in the class would have decimals as well. Take the highest value from the data set and subtract it with the lowest value and divide it by 5. Number of classes = (highest value lowest value)/5. Nice numbers: 1, 2, 2. 5, 5 (class width should be one of these numbers or the multiples of 10, 100, 1000) Classes would be in the steps of 5, it is possible to have 5 and under 7, but it would be very difficult to find the midpoint. 156-88/5 = 18. 6 (we cannot have a decimal number, must be a nice number) The closest numbers is 10-20, it is closer to 10 so go by 10.