PLEASE HELP!!!!!! Very urgent!!!
State whether the following is true or false. Give reason for your answer.
a) There are many sources of data.
b) Data collected by investigator is called the secondary data.
c) There is a certain bias involved in the non-random selection of samples.
d) Non-sampling errors can be minimized by taking large samples.
e) Telephone survey is the most suitable merhod of collecting data, when the population is literate and spread over a large area.