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NCERT Summary: Data Handling
Data
- A data is a collection of numbers gathered to give some information.
- Raw data: Data obtained in the original form is called raw data.
- Array: Arranging the numerical figures in an ascending or a descending order is called an array
- Observations: Each numerical figure in a data is called an observation.
- Tabulation of data : Arranging the data in a systematic tabular form is called tabulation or presentation of the data.
Recording and Organising Data
- Data can be collected from different sources.
- Ekta is asked to collect data for size of shoes of students in her Class VI. Her finding are recorded in the manner shown below:
Ekta prepared a table using tally marks.
Pictograph
- A pictograph represents data through pictures of objects. It helps answer the questions on the data at a glance.
A Bar Graph
- Bars of uniform width can be drawn horizontally or vertically with equal spacing between them and then the length of each bar represents the given number. This method of representing data is called a bar diagram or a bar graph.
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FAQs on NCERT Summary: Data Handling
| 1. What is data handling in statistics? |  |
Ans.Data handling in statistics refers to the process of collecting, organizing, representing, and interpreting data. It involves methods to summarize data and make it easy to understand, allowing for better decision-making based on the information gathered.
| 2. Why is data representation important? | |
Ans.Data representation is important because it helps to visualize data in a clear and concise manner. Techniques like graphs, charts, and tables make it easier to identify trends, patterns, and relationships within the data, aiding in effective communication and analysis.
| 3. What are the different types of data? | |
Ans.There are two main types of data: qualitative and quantitative. Qualitative data refers to descriptive information that cannot be measured (e.g., colors, names), while quantitative data refers to numerical information that can be measured and analyzed (e.g., height, weight).
| 4. How can we calculate the mean of a data set? | |
Ans.To calculate the mean of a data set, you add all the values together and then divide the sum by the total number of values. The formula is: Mean = (Sum of all values) / (Number of values).
| 5. What is the purpose of a bar graph? | |
Ans.The purpose of a bar graph is to represent categorical data visually. It uses bars of different heights or lengths to show the frequency or amount of each category, making it easier to compare different groups within the data.
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