I want to invent a great pen, because the broken pen brings a lot of trouble to our daily life. When we are doing homework, I think the pen will not be damaged easily, and it will show how much ink is left, so that we will not worry about the exam any more. Pen should have MP3 function, also can record, of course, it will not be expensive MP.
The early development of statistical methods has two distinct influences: one is the mother who is committed to keeping the orderly records of government units (the country and statistics come from the same Latin root); the other is the gentlemanly gambling father, who relies on mathematics to improve his odds and chances. The influence of the game mother on his offspring, statistics, is represented by counting, measuring, describing and controlling Table, sort and census. All of these lead to modern descriptive statistics, from father's influence to modern inferential statistics, which is completely based on probability theory descriptive collection includes tabulation, description and descriptive data collection.
These data can be quantitative, such as the measurement of height, intelligence or grade level. These variables have potential continuous characteristics, or the data may represent qualitative variables, A large number of data, such as gender, university major or personality type, usually have to go through a process of summarization or simplification before being understood. Descriptive statistics is a tool to describe, summarize or simplify to comprehensible form.
Inferential statistics is a way to solve another type of problem, which is characterized by an attempt to use observational samples to make predictions. For example, a school administrator wants to determine the proportion of children who have been vaccinated against influenza among the children who come to school without breakfast in a large school system, or, whatever it is, as long as there is a little statistical knowledge, regulators will know It is unnecessary and inefficient to ask questions to every child. Therefore, the purpose of inferential statistics is to predict or estimate the characteristic population sample of a group based on the understanding of population characteristics.
Yesterday, I visited a model high school. My friend and I had a beautiful fountain in the middle of the campus. We started from the main building.
First, we went to the laboratory building, where some students were doing experiments. Then we entered the lecture hall behind the experimental building. We saw many students listening to the lecture given by the professor opposite.
The lecture hall is the art center. We watched a group of students Playing musical instruments, finally we came to the playground behind the school. Some boys were playing football games.
It was so exciting that we couldn't help cheering for them. It was an impressive visit.