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Authoritative PPT Summary
"Sampling" Data Analysis PPT Courseware 2
small tasks
Survey method one: A comprehensive survey like this for a certain purpose is called a census. For example, census;
Little knowledge: The census refers to a one-time survey and registration of the national population conducted household by household and person by person within a time period uniformly stipulated by the state and in accordance with unified methods, unified projects, unified questionnaires and unified standards. It includes the entire process of census data collection, data aggregation, data evaluation, analysis and research.
give it a try
Indicate which of the following surveys should be census and which should be sample surveys:
1. The fluorescent tube factory needs to test the life of a batch of lamp tubes.
2. Understand how residents handle waste batteries.
3. Understand the main entertainment methods of modern college students.
4. During the prevention and control of a certain sudden infectious disease, a school measured the body temperature of students.
5. The taste of a pot of dumplings
6. Security check before passengers board the plane
In order to understand the height situation of junior high school students across the country, Ding Ding designed the following survey plan:
① Divide slices according to east, west, south, north and middle.
② 3 middle schools will be selected from each region.
③Measure the height of all 1,500 junior high school students in these 15 middle schools.
We call the totality of the objects we want to examine a totality.
Each object of investigation that makes up the whole is called an individual.
A collection of individuals extracted from the population is called a sample.
The number of individuals in a sample is called the sample size.
practice
1. In order to understand students' satisfaction with school meals, the following programs have been developed. Which one do you think is the best? ( )
A. Interviewed 50 girls.
B. Interviewed 24 boys and 24 girls.
C. Interviews were conducted with one boy and one girl from each grade of seventh, eighth and ninth grade.
C. Interviews were conducted with one boy and one girl from each grade of seventh, eighth and ninth grade.
2. A manufacturer conducted a survey in three large shopping malls selling its products in a certain city and found that the sales volume of its products accounted for 40% of the sales volume of similar products in these three large shopping malls. Therefore, the factory claimed that their products accounted for 40% of the sales volume of similar products in the country. 40% of sales. Do you think this propaganda is credible? Why?
3. To understand how satisfied citizens are with the quality of tap water, do we need to ask every citizen? Can the results of a survey in one residential area represent the opinions of citizens in the city? What kind of sample survey do you think is more reasonable?
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For more information about the "Data Analysis and Sampling" PPT courseware, please click the "Data Analysis and Sampling ppt" tag.
"Sampling Survey" PPT courseware:
Contents of the first part of the "Sampling Survey" PPT courseware: Learning objectives: 1. Understand and master: census, spot check, population, individual, sample, sample size. 2. Be able to judge whether each survey is a census or a spot check, and be able to tell the reasons. 3. Can find out from a spot check..
"Sampling Survey" PPT:
"Sampling Survey" PPT Part One Content: Teaching Objectives: Knowledge and Skills: Understand the concepts of census, sample survey, population, individual, and sample, understand the application of census and sample survey, and understand their advantages and limitations in specific problems, Will choose the right one..
"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? ..