Surveys and Questionnaire Design

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Presentation transcript:

Surveys and Questionnaire Design Objective: Recognize faulty questions on a survey and other factors that can bias responses.

Many statistical studies obtain information from surveys Many statistical studies obtain information from surveys. A survey is conducted when a sample of individuals is asked to respond to questions about a particular subject. There are two types of surveys: interviewer-administered self-administered.

Interviewer-administered surveys Interviewer-administered surveys require a person to ask the questions. The interview can be conducted face to face in an office, on a street, or in the mall, or via telephone.

Self-administered surveys Self-administered surveys can be done by mail or in a group setting such as a classroom.

When analyzing the results of surveys, you should be very careful about the interpretations. The way a question is phrased can influence the way people respond.

Asking biased questions. When you are writing questions for a questionnaire, it is important to avoid these common mistakes. Asking biased questions. By asking questions in a certain way, the researcher can lead the respondents to answer in the way he or she wants them to. For example, asking a question such as “Are you going to vote for candidate Jones even though the latest survey indicates that he will lose the election?” instead of “Are you going to vote for candidate Jones?” may dissuade some people from answering in the affirmative.

Using confusing words. In this case, the participant misinterprets the meaning of the words and answers the questions in a biased way. For example, the question “Do you think people would live longer if they were on a diet?” could be misinterpreted since there are many different types of diets—weight loss diets, low-salt diets, medically prescribed diets, etc.

Asking double-barreled questions. Sometimes questions contain compound sentences that require the participant to respond to two questions at the same time. For example, the question “Are you in favor of a special tax to provide national health care for the citizens of the United States?” asks two questions: “Are you in favor of a national health care program?” and “Do you favor a tax to support it?”

4. Using double negatives in questions. Questions with double negatives can be confusing to the respondents. For example, the question “Do you feel that it is not appropriate to have areas where people cannot smoke?” is very confusing since not is used twice in the sentence.

5. Ordering questions improperly By arranging the questions in a certain order, the researcher can lead the participant to respond in a way that he or she may otherwise not have done. For example, a question might ask the respondent, “At what age should an elderly person not be permitted to drive?” A later question might ask the respondent to list some problems of elderly people. The respondent may indicate that transportation is a problem based on reading the previous question.

Other factors that can bias a survey he participant may not know any thing about the subject of the question but will answer the question anyway to avoid being considered uninformed. Many people will make responses on the basis of what they think the person asking the questions wants to hear. For example, if a question states, “How often do you lie ? ” people may understate the incidences of their lying.

Other factors that can bias a survey Participants will, in some cases, respond differently to questions depending on whether their identity is known. The time and place of the survey and whether the questions are open- ended or closed-ended. One problem with a closed-ended question is that the respondent is forced to choose the answers that the researcher gives and cannot supply his or her own. But there is also a problem with open-ended questions in that the results may be so varied that attempting to summarize them might be difficult, if not impossible.

a pilot study should be done to test the design and usage of the questionnaire (i.e., the validity of the questionnaire). The pilot study helps the researcher to pretest the questionnaire to determine if it meets the objectives of the study. It also helps the researcher to rewrite any questions that may be misleading, ambiguous, etc.

If the questions are being asked by an interviewer, some training should be given to that person. If the survey is being done by mail, a cover letter and clear directions should accompany the questionnaire. Questionnaires help researchers to gather needed statistical information for their studies; however, much care must be given to proper questionnaire design and usage; otherwise, the results will be unreliable.

When constructing questions for questionnaires you should: Use simple language. Ask short questions. Provide tick boxes. Avoid open-ended questions. Ask questions in a logic order. Never ask a leading question. Never ask irrelevant questions. Avoid personal questions. Make sure there is a question that will certainly get a response from everyone to whom it is put.

Assignment: Working in groups of 4, each group will use Forms to design a survey that test the quality of the food in the cafeteria, When you are done, Please imped the link of your form into the Class Notes in the collaboration Section. Name the Page with your group members name