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Authoritative PPT Summary
"Census and Sampling Survey" PPT courseware 2
Target tips
learning target:
1. Understand and be able to distinguish between census and sample survey in specific situations;
2. Be able to describe the characteristics of census and sampling surveys, and understand the necessity of sampling;
3. Understand the meaning of population, individual, sample and sample size, and be able to point them out in actual situations.
Learning focus: Be able to distinguish between census and sample survey, and be able to point out the population, individual, sample and sample size;
Learning difficulties: Choose appropriate investigation methods in actual problems.
2. Independent learning
Self-study textbook P84-P85, complete the following questions
1. The ________ conducted on ____ inspection objects for the purpose of _____ is called a census. The totality of objects under investigation is called ________, and each object under investigation that makes up the whole is called _______.
2. People extract some _____ from _____, and based on the investigation of this part of individuals, _____ the ________ of the object being inspected. This kind of investigation is called __________. A part of the individuals selected from the population constitutes a ________ of the population. The number of individuals in the sample is called __________.
1. Is the following survey a census or a sample survey?
(1) If you want to know how salty a pot of food is, take a little and taste it;
(2) In order to know whether the watermelon is sweet or not, cut a triangular opening in a certain part of the watermelon, take out a piece and taste it;
(3) In order to record the amount of precipitation during a certain rain, the school meteorological team used a rain gauge to collect and measure the rainwater;
(4) In order to understand the time spent by students in Class 1 of seventh grade on extracurricular homework, the teacher distributed a questionnaire to each student in the class for investigation.
2. In order to understand the weight of the students in Class 3 of seventh grade, the weight of 20 students was randomly checked. In this question, what are the population, individual, sample, and sample size?
[Inspection object]: Data that represents a certain characteristic of something, not the thing itself
Group Discussion What are the units of the data in the above question?
Overall: Weight of all students in Class 3, Grade 7
Individual: The weight of each student in Class 3, Grade 7
Sample: The weight of these 20 students
Sample size: 20
Note: Sample size is just a quantity and has no unit.
Correspondence training
1. In order to understand the scores of 6,000 students in our city who took the Mathematics Graduation Examination, we selected the scores of 200 candidates for statistics. In this question, the following statements are made: (1) The total mathematics scores of these 6,000 students are overall. (2) Each candidate is an individual. (3) 200 candidates are a sample of the population. (4) The sample size is 200, and the number of correct statements is:
A. 4 B. 3 C. 2 D. 1
2 In order to understand customer satisfaction with the quality of a certain home appliance product, 50 people were selected for telephone follow-up on the product. Indicate the population, individual, sample, and sample size of this sample survey.
overall:
individual:
sample:
Sample size:
summary
1. Be able to distinguish between census and sample survey
2. Be able to point out the population, individual, sample, and sample size in specific situations.
3. Be able to choose appropriate investigation methods
Homework assignment
1: Exercise 4.1 Review and Consolidation 2, 3, 4
2: Workbook P31 1-8
3: Prestigious school classroom 4.1
4: Preview 4.2 Thinking about what is simple random sampling?
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"Census and Sampling Survey" PPT courseware 3:
"Census and Sample Survey" PPT Courseware 3 Learning Objectives 1. Understand the significance of census and sample survey, and be able to distinguish between census and sample survey in specific situations. 2. Be able to describe the characteristics of census and sampling surveys, and understand the necessity of sampling. 3. Understand the overall, individual,...
"Census and Sample Survey" PPT courseware:
"Census and Sample Survey" PPT Courseware Communication and Discovery In social production and real life, in order to make scientific and reasonable judgments and decisions on certain issues, it is usually necessary to first collect some relevant data through surveys, and then conduct analysis and research. In our country from 1984 to 19..