"Simple Random Sampling" PPT courseware

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"Simple Random Sampling" PPT courseware

communication and discovery

In order to understand the participation of students in sports activities during the summer vacation, the school is going to select a group of students for a survey. Do you think the results obtained according to the following survey method can reflect the general situation of the entire school's students? If it cannot be reflected, how should the investigation be conducted?

Method 1: Survey 30 students on the school’s track and field team;

The sample selected is the school track and field team, which has many summer activities.

Method 2: Survey male students in each class;

Only male students were surveyed, female students were not surveyed

Method 3: Select 1 student from each class for investigation

The sample size selected is too small and cannot objectively reflect the situation of the entire school.

Method 4: Select half of the students in each class to conduct the survey

Although the results can reflect the general situation of students across the school, the sample size is large and requires more manpower and time.

definition

In order to obtain results that can objectively reflect the problem, samples are usually drawn based on the principle that every individual in the population has the same chance of being drawn. This method of drawing samples is called simple random sampling.

Use your brain

1. Do you think the following investigation and judgment are correct? Why?

(1) A report titled "Most students in our school do not eat breakfast" was published in a school's blackboard newspaper. The article said: "Our reporter investigated 20 students who went to the school's merchandise department to buy snacks during recess and found that 16 of them went to buy snacks because they did not eat breakfast. From this, it can be inferred that 80% of students in our school No breakfast at home.”

(2) During a live broadcast of a basketball game, the commentator introduced the heights of three Chinese players participating in the American Professional Basketball Game (NBA). One viewer compared the average height of these three people with the average height of American players and came to a conclusion: "The average height of Chinese people is taller than that of Americans."

2. A shopping mall randomly checked the turnover of seven days in August. The data are as follows (unit: 10,000 yuan):

3.6, 3.2, 3.4, 3.9, 3.0, 3.1, 3.6

Try to estimate how many thousand yuan the store's business will be in August.

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"Simple Random Sampling" PPT courseware 3:

"Simple Random Sampling" PPT Courseware 3 Question asked In order to understand the participation of students in sports activities during the summer vacation, the school is going to select a part of the students for a survey. Do you think the results obtained according to the following survey method can reflect the general situation of the entire school's students? ..

"Simple Random Sampling" PPT courseware 2:

"Simple Random Sampling" PPT Courseware 2 Statistics Statistics: The study of quantitative characteristics and quantitative relationships of objective things. It is a science about the collection, sorting, induction and analysis methods of data. The basic idea of ​​statistics: Use samples to estimate the population, that is, usually without directly studying...

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Update Time: 2024-09-11

This template belongs to Mathematics courseware Qingdao Edition Seventh Grade Mathematics Volume 1 industry PPT template

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