Test: Collection of Data - 1 - Mechanical Engineering MCQ

A cover letter accompanies or transmits another document such as a survey questionnaire. Its purpose is to alert the respondent about the questionnaire it accompanies and to provide the details of requested actions on the part of the respondent. A cover letter is a living document that often accompanies a resume.

These are collected from the very source of information. They are collected for the first time from the original source of information.

A good sample is one which is smaller than the population and is capable of providing reasonable accurate information about the population at a much lower cost and in shorter span of time. This kind of a sample is also known as representative sample.

Statistics helps in analysing economic problems and formulating policies to solve them. Statistics is the study of aggregate of facts numerically expressed.

Unbiased errors are those that arise accidently just on account of chance in the normal course of investigation. They are also known as compensating errors.

The correct option is Option C.

In stratified sampling, the population is divided into several homogeneous groups, known as "strata," based on specific characteristics (e.g., age, income, education). Then, samples are collected from each stratum to ensure that the sample accurately reflects the population's composition. This method helps in reducing sampling bias and increasing precision.

Non-response errors occur when the respondent refuses to respond or the person refuses to provide information.

The correct answer is:

b) Stratified sampling.

Explanation:

In stratified sampling, the population is divided into several homogeneous groups, known as "strata," based on specific characteristics (e.g., age, income, education). Then, samples are collected from each stratum to ensure that the sample accurately reflects the population's composition. This method helps in reducing sampling bias and increasing precision.

Primary data is data that is collected by a researcher from first-hand sources, using methods like surveys, interviews, or experiments. It is collected with the research project in mind, directly from primary sources.

Secondary data is the data that has already been collected through primary sources and made readily available for researchers to use for their own research. A researcher may have collected the data for a particular project, then made it available to be used by another researcher.
So it is a secondary  data.

A primary data source is an original data source, that is, one in which the data are collected firsthand by the researcher for a specific research purpose or project. Primary data collection is quite expensive and time consuming compared to secondary data collection. It is collected with the research project in mind, directly from primary sources.