Descriptive Statistics and Inferential Statistics
Read sections 4 and 5 from chapter 1, and then complete the questions at the end of each section. Section 4 introduces descriptive statistics by using examples and discusses the difference between descriptive and inferential statistics. Section 5 talks about samples and populations, explains how one can identify biased samples, and defines differential statistics.
Click http://onlinestatbook.com/2/introduction/descriptive.html link to open resource.