"Statistical Survey" data collection, arrangement and description PPT courseware 5

Description

"Statistical Survey" data collection, arrangement and description PPT courseware 5

Step 1: Collect data

Questionnaire year month

Among the following five types of TV programs, which one is your favorite ( ). (Single choice)

A． News b． Sports c. animation d. entertainment e. drama

After filling out, please give the questionnaire to the math class representative.

There are many methods for collecting data, such as: public opinion surveys, field surveys, media inquiries, experimental records, actual measurements, data inquiries, visit surveys, and questionnaire surveys.

Based on the above design, what issues do you think need to be paid attention to when designing a questionnaire?

Generally speaking, questionnaires should be concise and easy to answer. The content generally includes the design of the questions asked in the survey, the design of the answers to the questions, the design of the order of questions, etc.

Describe data

The way to describe data is to draw statistical charts, such as bar charts, fan charts, etc. With the advancement of information technology, computers can also be used to draw bar charts and fan charts.

analyze data

1. What information can you get from these two statistical charts?

2. What is the difference between these two statistical charts?

The difference: the bar chart can show the number of people who like a specific program, and the fan chart can show the percentage of each type of people to the total number of people.

discuss:

How to draw the corresponding fan chart based on percentages?

What is a fan chart used to describe the percentage of each data to the total?

The relationship between the area of ​​the sector and the central angle

1. The larger the area of ​​the sector, the greater the central angle ( ).

2. What is the relationship between the degree and the percentage of the central angle subtended by the sector?

In the previous activities, the entire class was the entire class we wanted to investigate. We investigated all the subjects. An investigation that examines all the subjects like this is a comprehensive investigation.

1. It is advisable to conduct a comprehensive investigation

①\When the number of individuals in the population is small and the research problem requires real conditions and high accuracy.

②\Investigation work is more convenient and non-destructive

③\When there are special requirements for the survey results, or when the survey results have special significance, such as the national census, we still have to conduct it in the following way.

Consolidation exercise one:

Which of the following surveys are suitable for comprehensive surveys? Which ones are not suitable?

(1) Investigate the ratings of CCTV's "Windmill";

(2) Investigate the favorite colors of my classmates;

(3) Investigate the lethality of a batch of artillery shells;

(4) Investigate the favorite subjects of my classmates;

(5) Investigate the favorite sports activities of my classmates;

Compare who is the best

4. The "First General Report on China's Urban Household Property Survey" released by the National Bureau of Statistics in 2003 shows that as of June 2003, the average value of my country's urban household property exceeded 228,300 yuan. Among them, the average property value of households whose heads have the education level of elementary school, junior high school, high school, or college graduates is as shown in the figure:

①The education level of the head of the household with the most property per household is _______;

②The education level of the household head with the least property per household is _______;

③The education level of household heads above the average line of 228,300 yuan is _______;

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Update Time: 2024-11-25

This template belongs to Mathematics courseware People's Education Press Seventh Grade Mathematics Volume 2 industry PPT template

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