(i) There are many sources of data (true/false)
(ii) Telephone survey is the most suitable method of collecting data, when the population is literate and spread over a large area (true/false)
(iii) Data collected by investigator is called the secondary data (true/false).
(iv) There is a certain bias involved in the non-random selection of samples (true/false)
(v) Non-sampling errors can be minimized by taking large samples (true / false)
