"Statistics and Possibility" general review PPT courseware

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"Statistics and Possibility" general review PPT courseware

Statistical data is filled in a table of a certain format to reflect the situation and explain the problem. Such a table is called (statistical table). A statistical table containing only one item is called a (single-entry statistical table), and a statistical table containing two or more statistical items is called a (multiple-entry statistical table).

bar chart

①According to the size of the drawing, draw two mutually perpendicular rays.

② On the horizontal ray, appropriately allocate the positions of the bars and determine the width and spacing of the straight bars.

③ On the ray perpendicular to the horizontal ray, determine how much the unit length represents based on the specific conditions of the size of the data.

④Draw straight bars of different lengths based on the data and indicate the quantity.

Line chart

The steps for making a line chart are basically the same as making a bar chart, except that instead of drawing straight bars, each point is traced according to the size of the data, numbered, and then connected in sequence with line segments.

fan chart

① Calculate the percentage of the quantity of each part to the total quantity.

② Calculate the number of central angles of the sector representing the number of each part.

③Draw a circle with an appropriate radius, and draw each sector in the circle according to the central angle calculated previously.

④Indicate the quantity name and percentage of each part represented in each sector, and use different colors or stripes to distinguish each sector.

Analysis: This question is a test of mastering the characteristics of statistical charts. Answer questions based on the characteristics of each statistical chart and the relevant data reflected. It is not only necessary to discover some superficial data, but also to discover deeper information from the data.

1. Based on the above statistical table, what information did you get?

(1) From the statistical table, we can see the number of men and women in Class 61 and the number of students in the whole class.

(2) From the fan chart, we can know the percentage of the number of boys and girls in Class 61 to the whole class.

(3) The bar chart shows the favorite sports of boys and girls in Class 61. Among them, more boys like football than girls, more girls like skipping than boys, and as many boys and girls like table tennis...

(4) The broken line statistical chart shows the changes in the number of students in Class 61 who are satisfied with their overall performance in each grade. Among them, in Grade 6, the number of students who are most satisfied with their overall performance is the largest.

(5) From the statistical table, we can see that there are 4 more boys than girls. From the bar chart, we can see that this is a horizontal bar chart. There are 9 more boys than girls who like football. The number of girls who like skipping is 3 times that of boys. …

2. In addition to collecting data through questionnaires, what other means can be used to collect data? Determine the method of investigation: field surveys, measurements, questionnaires, or collecting information from various media

3. What are the main steps in doing a statistical work?

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Update Time: 2024-09-24

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