Which of the four methods of data collection is involved when a person retrieves data from an online database?
举一反三
- The British Airways Internet site provides a questionnaire instrument that can be answered electronically. Which of the four methods of data collection is involved when people complete the questionnaire?
- A marketing research firm, in conducting a comparative taste test, provided three types of peanut butter to a sample of households randomly selected within the state. Which of the four methods of data collection is involved when people are asked to compare the three types of peanut butter?
- TCM doctors obtain the clinical data by four diagnostic methods which include______ ______ ______ ______
- （ ）is a collection of data sets， which is so large and complex that it becomes difficult to process using on-hand database management tools or traditional data processing applications.
- A contains a collection of interrelated data, a set of programs to access the data and an environment that is both convenient and efficient to use. A: DBMS B: Database C: Database application D: Data Schema