"Data Collection" Data Collection and Processing PPT Courseware 6

"Data Collection" Data Collection and Processing PPT Courseware 6

1. This year, 90,000 junior high school graduates in our city took the entrance examination. In order to understand the mathematics scores of 90,000 candidates, the mathematics scores of 2,000 candidates were selected for statistical analysis. In this problem the total is ()

A. 90,000 candidates

B． 2000 candidates

C. Mathematics scores of 90,000 test takers

D. Mathematics scores of 2,000 candidates

[Analysis] What we need to understand is the mathematics scores of the candidates, not the candidates, so the overall mathematics scores are the mathematics scores of 90,000 candidates.

2. In order to understand the number of passengers during the summer vacation, Qingdao Railway Station randomly checked the number of morning passengers for 15 days. The number of morning passengers randomly checked for these 15 days was based on this question ()

A. Overall b. individual

C. A sample D. nothing

[Analysis] The purpose of the survey is to understand the number of passengers during the summer vacation, so the number of morning passengers in the 15 days randomly checked is a sample of this problem.

3． The following surveys: ① Understand the quality of ice cream in the summer cold drink market; ② Understand the passing rate of Li Hong’s 60 multiple-choice English questions; ③ Understand the lethality range of a batch of missiles; ④ Understand the personality of young Internet fans around the world. What is not suitable for census but suitable for sample survey is ()

A. ①②④ B. ①③④C. ②③④ D. ①②③

[Analysis] According to the definition of sampling survey, it can be seen that the several situations given in ①③④ are suitable for sampling survey.

Classification example

One type of statistical method

Proposition angle:

Select statistical methods based on the object of investigation

[2011•Yangzhou] Among the following surveys, the census method is suitable ()

A. Understand the killing radius of a batch of artillery shells

B． Understand the ratings of Yangzhou TV Station's "Focus" column

C. Learn about the types of fish in the Yangtze River

D. Understand the awareness rate of a certain class of students on “Yangzhou Spirit”

Type 2: Concepts related to statistics

Proposition angle:

1. population, individual, sample

2. Frequency, frequency

[2011•Taizhou] In order to understand the vital capacity of eighth grade students in a city, a sample survey of the lung capacity of 500 students was conducted. The sample in this survey was ()

A. Lung capacity of eighth grade students in a certain city

B． The lung capacity of 500 students sampled from

C. 500 students drawn from

D. 500

Type three: bar chart, line chart, sector chart

Proposition angle:

Application of bar chart, line chart and fan chart

[2011•Taizhou] On May 19, 2011, China’s first Tourism Day was officially launched. A certain school organized a tourism geography knowledge competition participated by 800 eighth-grade students. In order to understand the mastery of tourism geography knowledge, Teacher Li randomly selected the scores of some students as samples, and statistics were divided into four levels: excellent, good, passing, and failed, and the results were drawn as shown in Figure 36-2. The bar chart and sector chart shown (some information is not given).

Please answer the following questions based on the information provided above:

(1) Find the number of selected students;

(2) Please complete the bar chart and find the central angle number of the sector in the sector chart that indicates passing standards;

(3) Please estimate the total number of good and outstanding students among the 800 students in eighth grade.

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