"Statistical Survey" data collection, arrangement and description PPT courseware 7

Description

"Statistical Survey" data collection, arrangement and description PPT courseware 7

teaching objectives

knowledge and abilities

1. Master the method of data collection - questionnaire;

2. Master the methods of data collation - tables;

3. Master the methods of data depiction - bar charts and fan charts;

4. Understand the concept of comprehensive investigation.

Process and Method

1. After going through the preliminary statistical process of collecting and organizing data, you can draw tables based on the survey results, organize the data, and be able to make some decisions;

2. Understand the method of using statistical charts to depict data. In this process, hands-on practical skills and the ability to cooperate with each other to solve problems are cultivated.

Emotional attitudes and values

1. In the statistical process, good ideological and moral education is carried out;

2. Develop good habits of observation and thinking, and improve the ability to use mathematical knowledge to solve life problems;

3. Feel the connection between mathematics and life, and cultivate cooperation awareness and practical ability;

4. Be able to actively participate in solving practical problems, experience the practicality and rigor of statistics, and develop good habits of patience and meticulousness.

Knowledge points

Statistical survey:

It is a process of collecting objective and actual data in an organized and planned manner according to predetermined investigation requirements and using scientific investigation methods.

Requirements for statistical surveys:

(1) Accuracy - the information collected must conform to the objective actual situation.

(2) Timeliness-timeliness. Report various statistical data in a timely manner to meet various needs.

(3) Completeness-comprehensiveness. That is, the investigation information is collected without missing any information within the specified time.

(4) Economy - Obtain the required statistical data with as little investment as possible.

How to draw the corresponding sector diagram based on percentage or central angle?

1. First calculate the percentage of each part of the data collected in the total.

2. Multiply 360° by the percentage to find the central angle of each part, and then complete it with the help of a protractor.

3. Draw the proportions of each part in a circle and distinguish them by color.

4. Indicate the name and percentage of each part.

Questionnaire: Collect data.

Tables: organize data.

Statistical chart: an intuitive and vivid description.

Comprehensive investigation is an investigation method that conducts investigation and registration of all the overall units that constitute the investigation object group one by one.

For example, to understand the production of steel, a statistical survey of the steel production of all steel plants in the country would be a comprehensive survey. The fifth census conducted in our country in 2000 was also a comprehensive survey.

sample survey

Sampling survey: Only a part of the objects are selected for investigation, and then the situation of all objects is inferred based on the survey data.

Overall: In practical problems, the totality of a certain characteristic index of the object under study is called the overall;

Individual: Each object of investigation that makes up the population is called an individual;

Sample: An individual randomly selected from the population;

Sample: A sample is composed of several individuals randomly selected from the population;

Sample size: the number of individuals in the sample;

Sample value: the value of each individual in the population.

Class summary

General steps for statistics:

1. Collect data 3. Describe data

2. Organize data 4. analyze data

The respective characteristics of bar charts and sector charts:

Bar chart:

① Ability to display specific data in each group;

②It is convenient to compare the differences between data.

Sector chart:

Easily display the size of each set of data relative to the population.

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Update Time: 2024-10-02

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

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