1. Data is an information recorded and used for the purpose of analysis. It is quantitative or qualitative information. a. Quantitative refers to numerical information obtained from measuring or counting. Examples: age, test scores, amount of money, height, weight b. Qualitative refers to descriptive attributes that cannot be subjected to mathematical operations. Examples: blood type, hair color, ethnic group, educational attainment, religion 2. Population refers to the totality of all elements or persons for which one has an interest at a time. For example, the students of Grade 8 - Euclid, the graduating class, the female students at Rosario National High School. 3. Sample is a part of a population determined by sampling procedures. There are four types: a. In a Random sample, each member of the population has an equally likely chance of being selected. The members of the sample are chosen independently of each other. Example: At a party, teams for a game are chosen by putting everyone's name into a container, and then choosing the names (without looking) random for each team. b. A Convenience sample is a sample that is chosen so that it will be easy for the researcher. Example: An interviewer conducts a survey at Robinson's Mall early in the morning on a given day.
