"Data Collection" Data Collection and Processing PPT Courseware 3

Description

"Data Collection" Data Collection and Processing PPT Courseware 3

In the real world, there are many problems that cannot be solved by applying formulas and rules like we used to solve math problems. Instead, we need to carefully observe and accumulate data, and then organize, describe and analyze the data before we can give the answer. In other words, let the data speak.

1. In order to understand the situation of vehicles passing by the school gate, Xiao Ming used the extracurricular activity class to observe the vehicles passing by the school gate.

(1). How was the data here collected?

(2) What information and conclusions can you obtain from these data?

2. During a student physical examination held at the school, the doctor conducted pulse tests on a certain group of students as follows:

87 times, 65 times, 78 times, 76 times, 80 times, 72 times, 90 times,

3. In a coin tossing game (game rules: Toss a coin 10 times, the one with the most heads wins the prize). The number of times Xiao Ming got heads up was 6, and the number of times Xiao Gang got heads up was 5, so Xiao Ming won the prize.

May I ask how the two data "6" and "5" were collected?

Questionnaire

What do you think is the most important qualification for a host (select only one) ( )

A. Respond quickly B. Have a loud voice and standard Mandarin C. Be able to control the situation D. Have a warm and generous attitude E. Have a good image

Apply what you learn 1

Please connect the event to obtain data on the left with the way to obtain data on the right with a line.

①Xiao Ming wants to check the admission scores of various general high schools in Ruian City last year;

② The weight of the students in Class 7 (5);

③The number of heads up and heads down when tossing a coin 100 times;

④ The favorite film and television star of Class 7 (5) students;

⑤The number of basketball stands on the school basketball court.

2. Methods of data organization:

1. Measure the height data of 20 students from Class 6, Grade 7 as follows (unit: cm)

154 157 (female) 161 (female) 175

165 155 (female) 168 152 (female)

155(female) 154(female) 162 166

158(female) 164 156 165

162(Female) 169(Female) 150 163(Female)

2. If you want to order school uniforms for your classmates (uniform clothing for boys and girls):

154 157 (female) 161 (female) 175

165 155 (female) 168 152 (female)

155(female) 154(female) 162 166

158(female) 164 156 165

162(Female) 169(Female) 150 163(Female)

3. What processes do you need to go through to conduct a statistical activity?

Step 1: Clarify the survey question and purpose

Step 2: Determine the objects of investigation

Step Three: Choose a Survey Method

Step 4: Implement the survey (in various forms, such as questionnaires, interviews, etc.)

Step 5: Collect and organize data

Step 6: Analyze the data and draw conclusions.

Experience the data collection process

Step 1: Define the survey question—Who is the most trusted member of the class?

Step 2: Determine the target of the investigation—every student in the class.

Step 3: Choose the survey method - adopt the public opinion poll method of voting, and the person with the most votes will be elected as the squad leader.

Step 4: Conduct an investigation - Each student writes the name of the candidate he thinks is the most suitable on the paper and puts it into the election box.

Step 5: Record the results - one student sings the votes, another student counts the votes (record the number of votes for each candidate by drawing the word "正"), and another student supervises.

Step 6: Draw a conclusion—announce the student with the most votes as the class president

Think about it: How are the statistics in the following activities obtained?

1. In order to get "the number of times heads appear when a uniform coin is tossed 50 times."

2. If you want to know the total amount of water resources and per capita water resources in our country, how do you plan to obtain these data?

What did you gain from studying this course?

1. Method of collecting data:

(1) Observation, measurement, experiment, investigation, etc.;

(2) Consult literature, the Internet, etc.

2. Methods of organizing data:

(1) Classification, sorting (2) Grouping, coding

3. What processes do you need to go through to engage in a statistical activity?

practice

Regarding the following statistical objectives, what method do you think is more appropriate to collect data?

(1) The number of gold medals won by our country in the past three Olympic Games.

(2) The birth dates of all the students in the class.

(3) The popularity of a certain brand of beverage.

(4) The number of people on the playground one hour after school in the afternoon.

(5) The content of melamine in a certain brand of milk powder.

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Update Time: 2024-11-22

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