"Dispersion Degree of Data" Data Analysis PPT Download (Lesson 1)

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"The Dispersion Degree of Data" Data Analysis PPT Download (Lesson 1), 32 pages in total.

Part 1: New Knowledge

Knowledge points extremely poor

In real life, in addition to caring about the central tendency of the data, people often also pay attention to the degree of dispersion of the data, that is, their deviation from the central tendency. The difference between the largest data and the smallest data in a set of data (called the range) is A statistic that describes the degree of dispersion of data.

Knowledge point variance

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If Factory C also participates in the competition, sample from this factory

20 chicken legs were investigated and the data are shown in the figure.

(1) What are the average and range of the quality of these 20 chicken legs in Factory C?

(2) How to describe the difference between the quality of the 20 chicken legs in Factory C and its average number? Calculate the difference between the quality of 20 chicken legs from factories A and C and their corresponding averages.

(3) Among the two factories A and C, which factory do you think the quality of chicken legs meets the requirements better? Why?

Dispersion degree of data PPT, part 2 content: Class summary

1. Variance is an important statistic used to measure the fluctuation of a set of data. It reflects the fluctuation of data around the mean. For two sets of data of the same problem, the greater the variance, the greater the fluctuation of the data. The smaller the variance, the smaller the data. The smaller the fluctuation; the sample variance is often used in statistics to estimate the population variance.

2. The range is the difference between the largest data and the smallest data in a set of data. Range can reflect the range of changes in data and is the simplest measure of data fluctuations.

3. The standard deviation is the arithmetic square root of the variance.

Keywords: Free download of Beijing Normal University edition eighth-grade mathematics PPT courseware for volume 1, data discreteness PPT download, data analysis PPT download, .PPT format;

For more information about the "Data Analysis and Dispersion Degree of Data" PPT courseware, please click on the Data Analysis PPT and Data Dispersion Degree PPT tab.

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Update Time: 2024-11-24

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