Data collection Instruments in the quantitative research:
Data collection instruments are usually pretested to assure the validity and reliability of the of the research study. A study is
valid if it collects the appropriate data needed to answer the questions or objectives stated in the first stage of the research process. A study is said to be
reliable if the same questions, asked of a similar sample, produce the same findings. Some of the instruments used to collect the data are questionnaires, personal inventories, and attitude scales.
For quantitative research, the primary data collection instrument is the questionnaire which can be sent through the mail to the selected respondents for self-administration. It can also be administered by field interviewers in person or by telephone.
Personal inventories are series of statements that are presented to the respondents to indicate the degree of agreement or disagreement. The difference between the personal inventories and the questionnaires is that the inventory presents a list of statements, while questionnaires ask a series of questions.