Activity 13.1 Collecting data 1. Say in each case whether information can be gathered by means of observation, an interview or a written questionnaire. a) How many vehicles use a certain road between \( 16: 00 \) and \( 18: 00 \) on weekdays? b) What are the water consumption habits of a typical Grade 10 learner? c) Will you use the Gautrain on a regular basis to go to work?

1. **a) Observation** Since the question asks for the number of vehicles using a road between \( 16:00 \) and \( 18:00 \) on weekdays, this information can be directly gathered by watching and counting the vehicles during that time period. 2. **b) An interview or a written questionnaire** The water consumption habits of a typical Grade 10 learner involve personal behavior or routine practices that cannot be deduced merely by looking. Instead, these habits must be obtained by asking the learner, which can be accomplished through an interview or a written questionnaire. 3. **c) A written questionnaire (or possibly an interview)** The question "Will you use the Gautrain on a regular basis to go to work?" asks for a personal opinion or intention. This information is best collected by obtaining a response directly from the individual, which can be efficiently done using a written questionnaire.