What is the concept of validity in a research study?
The validity of a research study refers to how well the results among the study participants represent true findings among similar individuals outside the study.
What are some examples of reliability?
The term reliability in psychological research refers to the consistency of a research study or measuring test. For example, if a person weighs themselves during the course of a day they would expect to see a similar reading. Scales which measured weight differently each time would be of little use.
How do you determine the reliability of a machine?
It is calculated by dividing the total operating time of the asset by the number of failures over a given period of time.
Why is reliability and validity important in assessment?
It is important to understand the differences between reliability and validity. Validity will tell you how good a test is for a particular situation; reliability will tell you how trustworthy a score on that test will be. You cannot draw valid conclusions from a test score unless you are sure that the test is reliable.
What is meant by reliability is necessary but not sufficient for validity?
What does it mean that “reliability is necessary but not sufficient for validity”? If a measure is valid, it is also reliable. If reliability is low, can something be valid. When reliability is low, it can’t be valid.
What type of validity measures how similar a test is to another measure purporting to measure the same thing?
Concurrent validity refers to the degree of correlation of two measures of the same concept administered at the same time. Predictive validity refers to the degree of correlation between the measure of the concept and some future measure of the same concept.
Is the degree to which a measure is free from random error?
The degree to which a measure is free from random error is its reliability. Reliability refers to the measuring instrument rather than to the characteristic itself. Validity is the extent to which performance on a measure is related to performance on the job.
Do random errors affect validity?
Random errors will shift each measurement from its true value by a random amount and in a random direction. These will affect reliability (since they’re random) but may not affect the overall accuracy of a result.