Collection of Data

• Interview - direct method of gathering data
• Questionnaire - indirect method of gathering data
• Interview - requires face-to-face interaction with the respondent
• Questionnaire - this makes use of written questions to be answered by the respondent
• Observation - makes use of the human senses in gathering information
• Registration / Census - an official count or survey, especially of a population
• Experimentation - usually conducted in laboratories to find out cause and effect relationships
• Primary Data - information gathered directly from the source (interview, observation, experimentation)
• Secondary Data gathered from the secondary sources (books, magazines..)
• Slovins Formula - n= N/1+Ne^2
• e = margin of error