How Do You Ensure Validity And Reliability Of A Questionnaire?

How do you increase the validity of a questionnaire in psychology?

Internal validity can be improved by controlling extraneous variables, using standardized instructions, counter balancing, and eliminating demand characteristics and investigator effects..

What is the reliability and validity of a questionnaire?

Reliability refers to the degree to which the results obtained by a measurement and procedure can be replicated. Though reliability importantly contributes to the validity of a questionnaire, it is however not a sufficient condition for the validity of a questionnaire.

What is the difference between the validity and reliability of a survey questionnaire?

Validity is concerned with the accuracy of your survey. It depends on asking questions that truly measure what is supposed to be measured. … Reliability on the other hand, is concerned with consistency or the degree to which the questions used in a survey elicit the same kind of information each time they’re asked.

Why do questionnaires lack validity?

Questionnaires are said to often lack validity for a number of reasons. Participants may lie; give answers that are desired and so on. A way of assessing the validity of self-report measures is to compare the results of the self-report with another self-report on the same topic. (This is called concurrent validity).

Are questionnaires high in validity?

A survey can have high reliability but poor validity. A survey, or any measurement instrument, can accurately measure the wrong thing. For example, a watch that runs 10 minutes fast. However, for a survey, or measurement instrument, to have good validity it must also have high reliability.

How do you establish validity?

To establish construct validity you must first provide evidence that your data supports the theoretical structure. You must also show that you control the operationalization of the construct, in other words, show that your theory has some correspondence with reality.

How do you ensure a questionnaire is reliable?

One estimate of reliability is test-retest reliability. This involves administering the survey with a group of respondents and repeating the survey with the same group at a later point in time. We then compare the responses at the two timepoints.

How do you test the validity and reliability of a questionnaire using SPSS?

To test the internal consistency, you can run the Cronbach’s alpha test using the reliability command in SPSS, as follows: RELIABILITY /VARIABLES=q1 q2 q3 q4 q5. You can also use the drop-down menu in SPSS, as follows: From the top menu, click Analyze, then Scale, and then Reliability Analysis.

How do you ensure reliability in quantitative research?

Ensuring reliability Reliability should be considered throughout the data collection process. When you use a tool or technique to collect data, it’s important that the results are precise, stable and reproducible. Plan your method carefully to make sure you carry out the same steps in the same way for each measurement.

How do you increase the validity of a questionnaire?

When you design your questions carefully and ensure your samples are representative, you can improve the validity of your research methods.Ask Specific and Objective Questions. … Make the Sample Match the Target. … Avoid Self-selection. … Use Screening to Make Your Sample Representative.

How do you test for validity?

To evaluate criterion validity, you calculate the correlation between the results of your measurement and the results of the criterion measurement. If there is a high correlation, this gives a good indication that your test is measuring what it intends to measure.