introduction ST

Welcome.First lecture is introduction.Terminology to understand this lecture.

This lecture is friendly to anyone, whether have  some background.

Clarify terminology, structure.If you have questions, you can look up the glossary.

What is statistics?  Defined as  a scientific discipline devoted to the study of data（专门研究数据的学科）.

What is data? Defined as a collection of numbers assigned as values to quantitative variables(定量变量) and/or characters assigned as values to qualitative variables（定性变量）.

example:we have the academic record of a bunch of children in elementary school.We organize it into a spreadsheet. A data structure that has columns and rows.

Another way to define data is, it's the lowest level of abstraction, from which information and then knowledge can be derived.

Data ->Information->Knowledge

统计的类型介绍

The professor do research in cognitive psychology, especially in memory, attention and intelligence.

A statistic is just a quantity calculated from a sample of data, and we're going to do this a lot.

#line 178 7min 11s