Chapter 2 Statistics Class 11 Notes
Important Notes of complete Chapter 2 Statistics Class 11 Notes written by Professor Mr. Faraz Qasir Suib. These notes are very helpful in the preparation of Chapter 2 Statistics Class 11 Notes for the students of the intermediate and these are according to the paper patterns of all Punjab boards.
Summary and Contents:
Topics which are discussed in the notes are given below:
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- What do you meant by the term ‘classification’?
- Write down the types of classification
- How many forms of classification?
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- Define tabulation.
- Differentiate between class limits and class boundaries.
- What is meant by relative frequency of a class?
- Define frequency distribution.
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- Define class mark.
- Define histogram.
- What is the table?
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- Write down the main parts of the table.
- What is grouped data?
- What is simple classification?
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- Introduction to Representation of Data: Most scientific experiments are conducted in an attempt to answer some specific questions and generally result in the collection of data in the form of batches of numbers, usually referred to as sample. To extract information from the sample, there is need to organize and summarize the collected data.
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- There are many ways of describing a sample. Commonly, we use either, a graph or a small set of numbers which summarize some properties of the sample such as its centre and spread.
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- Classification of Representation of Data: The term classification is the process of arranging observations into different classes or categories according to some common characteristics.
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- The data may be classified by one or more characteristics at a time. When data is classified according to one characteristic, it is called one-way classification. When the data is classified by two characteristics at a time, it is called two-way classification. Similarly, the data classified by three characteristics is called three-way classification.
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- Tabulation of Representation of Data: The process of making tables or arranging data into rows and columns is called tabulation. Tabulation may be simple, double, triple or complex depending upon the number of characteristics involved. Tables are the most common form of documentation used by the scientists.
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- Construction of tables: Following are the parts of table out of which first four are main part.
- (i) Title: A title is the heading at top of the table. The title should be brief and self explanatory. It describes the contents of the table.
- (ii) Column Captions and Box head: The headings for different columns are called column captions and this part of column captions is called Box-head. The column captions should be brief, clear and arranged in order of importance.
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- (iii) Row Captions and Stub: The headings for different rows are called row captions and the part of the table containing row captions is called Stub. Row captions should be brief, clear and arranged in order of importance.
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- (iv) Body of the Table and Arrangements of the data: The entries in different cells of column and rows in a table are called body of the table. It is the main part of the table. The data may be arranged qualitatively, quantitatively, chronologically, geographically or alphabetically.
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- (v) Source Note: Source notes are given at the end of the table which indicate the compiling agency, publication, the data and page of the publication.
- (vi) Spacing and ruling: To enhance the effectiveness of a table, spacing and ruling is used. It is also used to separate certain items in the table.
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- Thick or double lines or single lines are used to separate row captions and column captions. To indicate no entry in a cell of the table, dots (...) or dashes(---) are used. Zeroes are not used in a table for this purpose.
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- (vii) Prefatory Notes and Footnotes: The prefatory note is given after the title of the table and the footnotes are given at the bottom of the table. Both are used to explain the contents of the table. The footnotes are usually indicated by***.
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