A private investigator â also known as a PI, Private Detective or Private Eye â is someone that is hired to undertake an investigation. Most states require PIs to be trained and licensed. Investigators often have a law enforcement and/or a military background. Back to Top.
Quantitative vs Qualitative. Quantitative and Qualitative are two terms between which a variety of differences can be identified. Quantitative has a lot to do with the quantity of an object or a person. On the other hand, qualitative has a lot to do with the quality or the attribute of an object or a person.
Experimental and Nonexperimental Research. The basic building blocks of quantitative research are variables. Variables (something. that takes on different values or categories) are the opposite of constants (something that. cannot vary, such as a single value or category of a variable).