what are the two main types of research instruments used to collect primary data

what are the two main types of research instruments used to collect primary data. There are some references to what are the two main types of research instruments used to collect primary data in this article. If you are looking for what are the two main types of research instruments used to collect primary data you've came to the right place. We have posts about what are the two main types of research instruments used to collect primary data. You can check it out below.