Question

1. What are the main sources of secondary data?
2. What precautions are necessary to use secondary data?
3. Define the terms (i) investigator, (ii) enumerator, and (ii) respondent
4. What are (i) measurement errors, and (ii) recording mistakes?​

Answer 1

Answer:

question number 1.. secondary data muse the data which is collected by the research of specialist or by the government

question number 2 definition of degree time interval between the periods comparison

..Etc