P is the principal; that's the amount you start with. The r is the interest rate. This is a decimal; in other words, if the interest rate is 9%, we use .09 in the equation. The n is the number of times the interest compounds each year. Finally, t is the time in years of the deposit or borrowed money.
Juan needs to create a questionnaire that adequately measures secondary traumatic stress so that his research study is valid. Secondary traumatic stress is the content domain in Juan's study. Content domain is the body of knowledge, skills or abilities being measured or examined by a test, experiment or research study.
A domain is a group of computers that are all connected to each other over a type of network. The main difference between a domain and a regular network is that data transfers over a domain are regulated by a server, whereas a regular network does not have this feature.