"Selection of Statistical Charts" Data Collection and Organization PPT (Lesson 2)

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"Selection of Statistical Charts" Data Collection and Organization PPT (Lesson 2)

Part One: Learning Objectives

1. Through specific problem situations, let students feel some misleading that artificial data and its representation may cause, and improve students' understanding, judgment and application ability of data;

2. Through surveys, statistics, seminars and other activities, students can further develop their statistical awareness and data processing capabilities, and be able to accurately and effectively express statistical quantities simply and clearly.

Selection of statistical charts PPT, part 2: independent learning feedback

1. The picture shown is a fan-shaped statistical chart of the number of boys in grades 7 and 8 participating in extracurricular activities in a school in Shenzhen. According to the statistical chart, the following judgment on the number of boys in grades 7 and 8 participating in basketball activities is correct ( )

A. There are more seventh graders than eighth graders. B. There are more eighth graders than seventh graders.

C. Both grades have the same number D. It is impossible to determine which grade has more

Analysis: The fan chart can only reflect the percentage of people in each grade participating in basketball activities. It cannot clearly indicate the specific number of people participating in basketball activities. Therefore, choose D.

2. The sales revenue of two companies, A and B, in recent years is as shown in the figure. The sales revenue has grown faster in recent years than _____ company.

Analysis: From the line chart, we can see that Company A’s sales revenue in 1998 was about 500,000 yuan, and in 2002 it was about 850,000 yuan. Therefore, Company A’s sales revenue increased by 85-50=350,000 yuan from 1998 to 2002. ); Company B's sales revenue in 1998 was 500,000 yuan, and its sales revenue in 2002 was 700,000 yuan. Then Company B's sales revenue increased by 70-50=200,000 yuan from 1998 to 2002. Then Company A's sales revenue Growth is faster. So fill the armor.

Selection of statistical charts PPT, the third part: explanation of new knowledge

Characteristics of bar graphs: It can clearly show the specific number of each item.

The characteristics of the line chart: it can clearly reflect the changes in things.

The characteristics of the fan chart: it can clearly show the percentage of each part in the whole

Analysis of classic examples

Based on the chart above, someone made a line chart of the price changes of two types of wine, A and B, in the chart below:

(1) Which kind of wine do you think the price of wine will grow faster? Why? Does this give you the same feeling as the line chart drawn above? Why does the image feel this way?

Answer: The price of type B wine has increased rapidly.

Reason: Type A wine has increased by 10 yuan in 4 years; and type B wine has increased by 10 yuan in 2 years, so the price of type B wine has increased faster. It feels inconsistent. The statistical chart of type A wine looks better than the broken line of type B wine. Changes quickly.

The abscissa (year) is "compressed", and the ordinate (price) is "amplified".

Discuss

(1) In order to compare the changing speed of two statistics more intuitively, what should be paid attention to when drawing a line statistical chart?

In the two images, the quantity represented by the same unit length on the horizontal axis should be consistent, and the quantity represented by the same unit length on the vertical axis should be consistent.

(2) In order to more intuitively reflect the proportional relationship between several statistical quantities, what should be paid attention to when drawing a bar chart?

Pay attention to whether the values ​​on the vertical axis start from 0.

Selection of statistical charts PPT, the fourth part: on-site testing

1. The figure below reflects my country’s exports of goods to three regions in 2009. Looking at this bar chart intuitively, (1) Which region did my country export the largest amount of goods to in 2009? Which region has the smallest export volume of goods? (2) How many times is the largest number about the smallest number? Does the intuitive situation shown in the picture match this? Why? (3) In order to more intuitively and clearly reflect the proportional relationship between my country's exports of goods to the three regions, what changes should be made?

Answer: (1) The export volume to the EU is the largest, and the export volume to Hong Kong is the smallest.

(2) It is about 1.5 times, but the picture gives the impression that it is more than 3 times, so it does not match. Because the vertical and horizontal lines of this bar chart do not start from 0.

(3) The vertical axis should be changed to start from 0, as shown in the figure after the change

Selection of statistical charts PPT, Part 5: Class summary

In order to visually compare the changing speed of two statistics,

When drawing a line statistical chart, attention should be paid to: the length of the same unit on the horizontal axis of the two charts should be consistent, and the meaning of the same unit length on the vertical axis should also be consistent;

When drawing a bar graph, in order to make the graph more intuitive and clear, it should be noted that the values ​​on the vertical axis should start from 0;

In a fan chart, without knowing the respective total amounts, the sizes of their respective amounts cannot be compared by their percentages.

Selection of statistical charts PPT, Part 6: Personalized assignments

1. Complete the homework of Group A in 6.4.2 Selection of Statistical Charts.

1. Complete the homework of Group B in 6.4.2 Selection of Statistical Charts.

Keywords: Beijing Normal University Edition seventh-grade mathematics PPT courseware free download, selection of statistical graphs PPT download, data collection and organization PPT download, .PPT format;

For more information about the PPT courseware "Selection of Statistical Charts, Collection and Sorting of Data", please click on the PPT tab of "Selection of Statistical Charts, Collection and Sorting of Data".

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Update Time: 2024-07-12

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