Test: Collection of Data - 2 - Commerce MCQ

When data is collected from the entire population it is called Census method. It includes total count. By this method, more reliable data can be obtained since every item of the whole population is included. The merits of Census method include:
(a) It is accurate.
(b) It rules out errors of sampling since very item of the population is included.
(c) It is reliable

The demerits of Sampling include: It is subjected to errors since maybe a particular sample does not represent the whole population accurately, which will give us false results.

When the investigator himself does not make any investigation and rather uses the data which has been collected by some other researcher such data is known as secondary data. The sources of collecting secondary data are:
(i) published sources like newspapers, articles, blogs, etc.
(ii) unpublished sources like unpublished news, etc.
Hence, the correct answer is option D.

Stratified sampling is a type of sampling method in which the total population is divided into smaller groups or strata to complete the sampling process. The strata is formed based on some common characteristics in the population data. After dividing the population into strata, the researcher randomly selects the sample proportionally. Hence, correct answer is option B.

Census method is the method of statistical enumeration where all members of the population are studied. A population refers to the set of all observations under concern. In our country, the Government conducts the Census of India every ten years. This method must take into account all the units. It cannot leave out anyone in collecting data. Once collected, the Census of India reveals demographic information such as birth rates, death rates, total population, population growth rate of our country, etc. The last census was conducted in the year 2011. Hence, correct answer is option C.

Sampling is the process in which particular group is selected for the purpose of data collection and that particular group represents the whole population.. Hence, correct answer is option B.

Secondary data is the second-hand information as it is not collected by the user. Thus, secondary data refers to the data which is already collected and published by other authorities. For example, government census report is a secondary data. Hence, correct answer is option B.

Population or the Universe in statistics means totality of the items under study. Thus, the Population or the Universe is a group to which the results of the study are intended to apply. Hence, correct answer is option C.