"50 Years of Change" Statistics and Probability PPT Courseware 3

"50 Years of Change" Statistics and Probability PPT Courseware 3

Since the 1950s, my country's transportation situation has undergone tremendous changes. The following table reflects the changes in the length of transportation lines in my country over the past 50 years.

(1) Among the transportation modes of railways, highways, inland waterway shipping, and civil aviation, which one has developed most rapidly in recent years? Which mode of transportation has developed the slowest or even experienced negative growth for many years? How did you know?

(2) Can you explain the reason why that mode of transportation has experienced negative growth for many years?

(3) Which statistical graph do you think can better illustrate your point of view?

Be attentive and knowledgeable everywhere

Statistical charts appear frequently in newspapers, magazines, and advertisements, bringing us a lot of information, but it is very difficult to obtain accurate and useful information from them to help us make better objective judgments and decisions.

think about it

The following two figures show the price changes of two brands of wine in recent years. Which type of wine has seen a faster price increase? Does this match how the image makes you feel? Why do images give people this feeling?

Discuss

In order to compare the changing speed of two statistics more intuitively, what should we pay attention to when drawing a line statistical chart?

Answer: It should be noted that the same unit length on the two coordinate axes has the same meaning, so as to avoid "misleading" and "illusion".

think about it

Page 166: In-class exercises. (1) Which student is the tallest? Which one is the lowest? How much is the difference?

(2) How many times is Zhouzhou’s height higher than Xiaoli’s?

(3) Does this picture easily give people a wrong feeling? Why?

(4) In order to reflect the height status of these five students more intuitively and clearly, what changes should be made to this picture?

Friendly reminder

When drawing a bar chart, the starting value on the ordinate should start from "0" to avoid "misleading" and "illusion"; through the understanding of the two line charts, compare the changes in the two statistics When trending, attention should be paid to the consistency of the horizontal (vertical) coordinates; the fan chart can only show the percentage of each part in the total, and the same research in the two fan charts

Objects cannot be directly compared for size.

In order to understand the income status of rural residents in my country, relevant departments conducted a sample survey of rural areas across the country. The following table reflects the distribution of per capita net income of rural households in my country in 1985, 1990, 1995, and 1999

Answer the following questions based on the table below:

(1) In 1985, 1990, 1995, and 1999, in which range did my country’s rural per capita net income have the largest number of households? How did you figure it out?

(2) Please use appropriate statistical charts to represent the per capita net income of rural households in my country in 1985.

What "confusions" did you encounter when drawing?

①The ownership of points is unclear;

②The group distances are not equal.

When encountering this situation, you can draw a bar chart of discrete statistics.

(3) Please roughly estimate my country's rural per capita net income in 1985. How did you estimate it? Communicate with peers.

Do it

Do you still remember the ages of the Shanghai Oriental Sharks basketball team members from 2000 to 2001? Four students used a computer to draw the age of the players into the following statistical chart. You can observe the mode and median age of the team members from the chart. Number? Which graph did you use? How did you calculate it?

Class Summary

This lesson continues to present relevant information about changes in the past 50 years based on the previous lesson. We not only learned to read information from statistical tables, but also selected appropriate statistical charts to express this information intuitively and clearly, and further conducted data analysis. processing, studied relevant statistical measures, reviewed weighted averages, etc. I hope that students can happily cooperate and communicate and solve problems together during their studies.

Activities and Inquiry

Xiao Ning's math scores have been improving recently, with several test scores of 83, 89, 90, 92, 94, 97, 99, and 100. The teacher plans to draw a score chart for her and put it in her growth record bag , encourage her and ask you to help design it.

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For more information about the PPT courseware "Statistics and Probability Changes in 50 Years", please click the "Statistics and Probability ppt Changes in 50 Years" ppt tag.

"50 Years of Change" Statistics and Probability PPT Courseware 2:

"50 Years of Change" Statistics and Probability PPT Courseware 2 Discuss (1) In the distribution table of per capita net income of rural households in my country, in what range did my country's rural per capita net income fall in 1985, 1990, 1995 and 1999? The largest number of households? How did you figure it out? ..

"50 Years of Change" Statistics and Probability PPT Courseware:

"50 Years of Change" Statistics and Probability PPT Courseware Discuss: (1) Among the transportation modes of railways, highways, inland shipping, and civil aviation, which one has developed more rapidly in recent years? (2) Which mode of transportation has developed the slowest or even experienced negative effects for many years..