Tag: step towards making a project

A frequency array is a series of data arranged in ascending or descending order of magnitude. It helps in organizing raw data for easier analysis.

While the census method covers every item, it is technically prone to errors (like non-response or recording errors). However, in the context of introductory textbooks, it is often contrasted with sampling as having no 'sampling error'.

NASA is a government agency, so its publications are considered official publications. These are authoritative sources of data.

Data collected by an investigator for the first time for a specific purpose is defined as primary data. It is original and specific to the inquiry.

Random sampling is a method where every item in the population has an equal chance of being selected. It relies on probability rather than human choice or purpose.

Primary data is collected directly by the researcher, making it original or 'first hand' information. Secondary data is 'second hand'.

Data is generally classified into two main types based on the source of collection: primary data and secondary data.

The lottery method is a classic technique used in random sampling to ensure that every unit has an equal probability of being selected.

The questionnaire method has several limitations, such as low response rates, potential for misinterpretation of questions, and lack of control over the respondent.

Primary data is collected for the first time by the investigator, which makes it original in nature. It has not been processed or published by others previously.