"Statistical Survey" data collection, organization and description PPT courseware 3

"Statistical Survey" data collection, organization and description PPT courseware 3

On what basis did the International Olympic Committee decide that Beijing would host the 2008 Olympic Games?

After all Olympic Committee members vote, these votes need to be collected, organized and described. How to do this?

The city hosting the election needs to investigate all Olympic Committee members. We call this investigation a comprehensive investigation.

Question 1: What would you do if you wanted to know how much the entire class loves TV programs in five categories: news, sports, animation, entertainment, and opera?

Comprehensive investigation: An investigation that examines all objects is called a comprehensive investigation.

To solve question 1, a statistical survey is needed. First, use a questionnaire survey method to collect data from the entire class. A questionnaire should be designed for this purpose.

(Use data to illustrate the problem)

How to design a questionnaire? What should the questionnaire contain?

In order to obtain real data, the designed questionnaire should be able to answer "What is the purpose of the survey", "What is the object of the survey", "What content should the questionnaire contain", etc. Therefore, the content that should be included in the designed questionnaire is: Determine The purpose of the survey, the objects of the survey, and the content of the survey. Note: The date must be written on the questionnaire.

design the research survey

Survey Questionnaire Year Month Day

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

ANews BSports CAnimation DEntertainment EDrama

1. Collect data

Using a questionnaire, you can collect the numbers (letters) of each student's favorite program in the class, which we call data. For example, a classmate obtained the following 50 data after investigation:

C C A D B C A D C D

C E A B D D B C C C

D B D C D D D C D C

E B B D D C C E B D

A B D D C B C B D D

Messy data is not conducive to our discovery of patterns. In order to understand the patterns contained in the data more clearly, the data needs to be organized. Tables are often used to organize the data in statistics (as shown in the table below)

1. How to organize these data? (Establish reasonable statistical tables to organize data)

2. What content is needed in the statistical table? (Note that there must be a header)

3. Describe data

① Bar chart: It can clearly show the specific data of each project, making it easy to compare the differences between the data.

② Sector chart: The size of the sector is used to represent the percentage of a part in the whole. It is easy to display the size of each group of data relative to the total number, but it is impossible to judge the absolute size of each group of data.

③ Line chart: It can show the changing trend of data and reflect the changing laws and trends of the development of things.

Ⅰ. Make two coordinate axes perpendicular to each other. The horizontal axis represents different years, months and other times or different items; the vertical axis represents the number of statistical items;

Ⅱ. Draw corresponding points based on the number of each statistical item;

Ⅲ. Use line segments to connect the drawn points in sequence.

General process of data processing

(1) Collect data: generally use questionnaire survey

(2) Organize data: often use tables

(3) Describe data: use statistical charts

① Bar chart: It can display the specific data in each group and make it easy to compare the differences between the data;

② Sector chart: The size of the sector is used to represent the percentage of a part in the whole. It is easy to display the size of each group of data relative to the total, but it is impossible to judge the absolute size of each group of data.

③ Line statistical chart: It can show the changing trend of data and reflect the changing laws and trends of the development of things.

(4) Analyze data: meter reading chart

Class exercises

1. Two students used the following two questioning methods during the investigation. Which one do you think is better?

①Don’t you think science fiction movies are more interesting than martial arts movies?

②Which type of movie do you prefer--science fiction movies or martial arts movies?

2. The statistical chart is as shown in the figure:

①This statistical chart is a _____ shaped statistical chart;

②Xiao Ming did __ more pull-ups on Sunday than on Monday;

③If you want to show the changes in the number of pull-ups that Xiao Ming does continuously this week, you should use ____ statistical chart.

summary

What did we learn in today’s lesson?

1. Know how to record data using scratch notation.

2. Know how to use bar charts, fan charts, and line charts to describe data. Master related concepts;

3. Understand and compare the advantages and characteristics of bar charts, fan charts, and line charts;

4. Learn how to obtain information from charts and solve practical problems.

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