"Data Collection" Data Collection and Processing PPT Courseware 4

Description

"Data Collection" Data Collection and Processing PPT Courseware 4

Use your brain

The implementation of family planning is a basic national policy of our country. In recent years, one of the main measures taken is to encourage a couple to have only one child in their lifetime. Students are asked to make their own statistics on the following questions:

(1) The classmates in this class are only children and have _______;

(2) There are _______ fathers of classmates in this class who are only children;

(3) There are _______ students in this class whose mothers are only children.

practise

1. There are five kinds of snacks: potato chips, jelly, coconut candy, egg rolls, and chocolate pie. Xiao Ming conducted a questionnaire survey on the whole class and asked each student to fill in one (only one) that they like. Regarding the snacks he eats, he collected data on the snacks that boys and girls in the class like to eat, and drew a statistical table as follows:

Answer the following questions based on the statistical table:

(1) How many students are there in the class?

(2) Please fill in the missing data in the table based on the information provided in the statistical table.

(3) If you need to buy snacks for a class activity next time, what kind of food will you try to buy?

2. Design a questionnaire on "How do you use your spare time on weekends?" and survey the whole class. After collecting the questionnaire, use appropriate tables to organize the data to see what conclusions are drawn and make suggestions for the students' spare time arrangements. suggestion.

in conclusion

If we want to understand a certain aspect of the situation, we must collect an appropriate amount of data in this area based on actual needs.

How is data collected?

(1) Clarify the purpose of the investigation; (2) Determine the object of investigation;

(3) Select the investigation method; (4) Conduct the investigation specifically;

(5) Record the investigation results.

Example 1 For the following survey, the census method is more suitable than the sample survey method ( ).

A. Investigate whether the pigment content of a certain food in the province’s food market meets national standards

B. Investigate the service life of a batch of light bulbs

C. Survey the height of all students in your class

D. Survey the weekly pocket money of junior high school students across the country

Solution: Since the survey scope of option A is the entire province, with a large scope and many objects, it is not easy to use a census, but can only use a sample survey;

Option B: Surveying the service life of light bulbs is destructive, so it is not appropriate to use a census;

Option C: Since the number of students in your class is not very large, it is appropriate to use a census;

Option D. Since there are too many junior high school students in the country, it is not appropriate to use a census. Therefore, C should be selected.

Example 2 The following investigation method is suitable ( ).

A. In order to understand the lethality of artillery shells, a census is used

B. In order to understand the sleep status of middle school students across the country, a census is used

C. In order to understand people’s awareness of protecting water resources, a sampling survey is used

D. Inspection of parts of the manned spacecraft "Shenzhou 5" shall be carried out through sampling surveys.

It is impossible to use the census method for item A, it is very difficult and unnecessary to use the census method for item B, it is unscientific and not allowed to use the sample survey method for item D, and only the method selected for item C is necessary and also It's possible, so choose C.

Example 3 To understand the vision of eighth-grade students in my country, the appropriate survey method you think is ______.

Solution: The object of this question is the vision of eighth-grade students in my country. Obviously, there are too many eighth-grade students in the country, so it is unrealistic to use a census, so a sample survey should be used.

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Update Time: 2024-09-09

This template belongs to Mathematics courseware Beijing Normal University eighth grade mathematics volume 2 industry PPT template

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