"Frequency and Frequency" Data Collection and Processing PPT Courseware 4

Description

"Frequency and Frequency" Data Collection and Processing PPT Courseware 4

Reflection

What should you pay attention to when conducting a sample survey?

(1)Sample size

(2) Representativeness of sample

(3) Extensiveness of the sample

What is your favorite sport?

Who is your favorite sports star?

Why do you like them?

Discuss

Xiaoliang surveyed 50 students in Class 8(1) about their favorite football stars. The results are as follows:

(1) Based on this result, can you quickly name the favorite football star of the class?

(2) Can you design a better representation?

Gain new knowledge

Definition: We call the number of times each object appears as frequency, and the ratio of the number of times each object appears to the total number of times is frequency.

Do it (P186)

(1) Which Chinese character do you think is used most frequently?

(2) Students with the same views form a group, design a simple survey plan, roughly estimate its frequency of use, and share the survey results with the whole class.

Summary

How do we collect and process data?

(1) Determine the investigation object by determining the purpose of the investigation;

(2) Collect relevant data;

(3) Choose a reasonable data presentation method to collect statistical data;

(4) Calculate based on the collected data and estimate the overall situation based on the characteristic numbers.

Discuss

This kind of statistical table is unorganized data, there is a lot of data, and the quantitative representation is not simple and intuitive. The number of people accounted for by each data is not directly given, and it still needs to be calculated.

Advantages: The quantitative representation is accurate, that is, it can accurately represent the number of people occupied by each data.

Disadvantages: It cannot intuitively reflect the overall pattern of data. There is also a lot of data.

Do it

Example: A sample is known to be: 61 79 63 57 81

55 54 66 59 80 56 83 70 80

60 54 76 69 64 67 58 72 75

85 79 61 58 58 68 81

Make a frequency distribution table and draw a frequency distribution histogram;

(1) The maximum value is 85, the minimum value is 54, and the difference is 31;

(2) Determine the group distance, and the group distance is 4;

(3) Determine the points;

(4) Column frequency distribution table;

(5) Draw a frequency distribution histogram.

summary

What are frequency and frequency? How to calculate frequency?

How is data collected?

How to draw frequency distribution histogram and frequency distribution line chart?

Frequency, frequency, frequency distribution table, frequency distribution histogram and frequency distribution line chart all reflect the distribution of a set of data.

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Update Time: 2024-10-20

This template belongs to Mathematics courseware Beijing Normal University eighth grade mathematics volume 2 industry PPT template

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