What is Data?
Data can be defined as a systematic record of a particular quantity. It is the different values of that quantity represented together in a set. It is a collection of facts and figures to be used for a specific purpose such as a survey or analysis. When arranged in an organized form, it can be called information.
What are grouped data and ungrouped data?
Grouped data means the data (or information) given in the form of class intervals such as 0-20, 20-40, and so on. Ungrouped data is defined as the data given as individual points (i.e. values or numbers) such as 15, 63, 34, 20, 25, and so on.
What is a grouped data example?
Suppose we have data ranges from 0 to 50 like 2, 17, 0, 1, 8, 19, 43, 2, 1, 32, and so on. In this case, we can group the data into classes such as 0-10, 10-20,…,40-50. This is a simple example of grouped data.
What are the advantages of grouping data?
The main advantages of grouping data are:
- Assist us in concentrating on essential subgroups mainly and overlook trivial ones.
- Helps in increasing the efficiency and correctness of the required estimation.
How do you group data into a class?
An important technique used for grouping the given data is tally marks. With the help of a tally marks table, it is possible to convert the data into classes without any confusion. Then find the height (or size) of the class interval by dividing the difference between the highest and the least data value by the number of classes we want (in the case of the decimal value, the nearest whole number defines the class size).
How many classes can a grouped data have?
For ideal grouped data, it is suggested to have the number of class intervals as a minimum of 5 and a maximum of 20. But we can also observe grouped data with less than 5 class intervals in many situations.