QMS 102 Lecture Notes - Lecture 1: Secondary Source, Descriptive Statistics, Qualitative Property

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

Document Summary

Descriptive statistics involves collecting, organizing, presenting, analyzing, and interpreting data to assist decision- making. In this course, we use this process to make business decisions. In a class of 80 students, the professor recorded the marks of 20 students for their first test. The scores 85, 56, 80, 95, 89, 78, 58, 42, 69, 99, 98, 85, 23, 12, 58, 67, 94, 80, 57, 84 are the data that the professor has collected. Now she can organize the data as follows. One way of presenting data is by using a table. Constructing a percentage column is a simple way of analyzing the data although it is not a statistical method. Forty percent of student marks were in the 81 - 100 range. Sixty-five percent of the students received at least 61 marks. In the above example, the data are numerical.