What is instrument reliability and validity?

What is instrument reliability and validity?

Posted May 16, 2013. Reliability and validity are important aspects of selecting a survey instrument. Reliability refers to the extent that the instrument yields the same results over multiple trials. Validity refers to the extent that the instrument measures what it was designed to measure.

Who is a reliable person?

a reliable person is someone who you can trust to behave well, work hard, or do what you expect them to do. Alice can look after the children. She’s very reliable. a reliable workman/car.

What are reliability issues?

Reliability refers to the extent to which studies can be repeated, and if they can, whether the same sorts of results would be obtained. Consistency of research is the important principle here. Reliability is another issue where opinions may vary regarding each study.

How can you improve the validity of a scientific investigation?

You can increase the validity of an experiment by controlling more variables, improving measurement technique, increasing randomization to reduce sample bias, blinding the experiment, and adding control or placebo groups.

Why are scientific theories often so powerful?

3. Why are scientific theories often so powerful? Scientific theories are so powerful because they cannot be proven wrong unless other tests are wrong. Scientific theories are the most definitive and accurate types of evidence that a jury can see because these tests that are run are so accurate.

How do you know if research is valid or reliable?

8 ways to determine the credibility of research reports

1. Why was the study undertaken?
2. Who conducted the study?
3. Who funded the research?
4. How was the data collected?
5. Is the sample size and response rate sufficient?
6. Does the research make use of secondary data?
7. Does the research measure what it claims to measure?

Why do you think your research is reliable?

The idea behind reliability is that any significant results must be more than a one-off finding and be inherently repeatable. Other researchers must be able to perform exactly the same experiment, under the same conditions and generate the same results.

How do you ensure reliability in an experiment?

Improve the reliability of single measurements and/or increase the number of repetitions of each measurement and use averaging e.g. line of best fit. Repeat single measurements and look at difference in values. Repeat entire experiment and look at difference in final results.