Math Vantage videotape series (ENC-014557) Data : how do you get it? This unit of videotapes on proportional reasoning aims to motivate pre-algebra students with high energy footage of real world situations that illustrate key mathematical concepts and applications. This videotape shows how surveys, observation, analysis of past records, and experimentation are tools for data collection. Examples include how a survey is constructed to gather data about the appeal of different toothpastes and why the observation of traffic patterns is a useful and important source of data. Also available for this Data Analysis Unit is a teacher's resource book with lesson plans, assessment ideas, and student worksheets.