Can a measure be reliable but not valid example?

Can a measure be reliable but not valid example?

For example, if your scale is off by 5 lbs, it reads your weight every day with an excess of 5lbs. The scale is reliable because it consistently reports the same weight every day, but it is not valid because it adds 5lbs to your true weight. It is not a valid measure of your weight.

Is it possible to have reliable results that are not valid?

Understanding reliability vs validity. Reliability and validity are closely related, but they mean different things. A measurement can be reliable without being valid. However, if a measurement is valid, it is usually also reliable.

Can a research instrument be reliable but not valid?

An instrument must be reliable in order to be valid. For an instrument to be valid, it must consistently give the same score. However, an instrument may be reliable but not valid: it may consistently give the same score, but the score might not reflect a person’s actual score on the variable.

What does it mean that reliability is necessary but not sufficient for validity?

Reliability is necessary but not sufficient for validity. If you used a normal, non-broken set of scales to measure your height it would give you the same score, and so be reliable (assuming your weight doesn’t fluctuate), but still wouldn’t be valid.

Can a reliable test be valid?

A test is valid if it measures what it is supposed to measure. Reliability and validity are independent of each other. A measurement maybe valid but not reliable, or reliable but not valid.

How can validity and reliability be improved in research?

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 is reliability necessary for validity?

Test score reliability is a component of validity. If test scores are not reliable, they cannot be valid since they will not provide a good estimate of the ability or trait that the test intends to measure. Reliability is therefore a necessary but not sufficient condition for validity.

How is an instrument considered valid and reliable?

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.

What does it mean that reliability is necessary but not sufficient for validity quizlet?

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.

Why is reliability necessary?

Reliability refers to the consistency of the results in research. Reliability is highly important for psychological research. This is because it tests if the study fulfills its predicted aims and hypothesis and also ensures that the results are due to the study and not any possible extraneous variables.

Can there be validity without reliability?

Despite the commonly touted axiom that there can be no validity without reliability (not vice versa), the simple answer to her inquiry is yes, there can be validity without reliability. She evidences this claim by looking critically at how we understand reliability in relation to assessment.

Can a test be valid without being reliable?

The tricky part is that a test can be reliable without being valid. However, a test cannot be valid unless it is reliable. An assessment can provide you with consistent results, making it reliable, but unless it is measuring what you are supposed to measure, it is not valid.

What is the difference between reliability and validity?

Validity refers to the similarity between the experiment value and the true value. • Reliability is related with the consistency of the measurements whereas validity is focused more on how accurate the measurements are. • By saying “a sample is reliable,” it doesn’t mean it is valid.

Can an unreliable test be valid?

If he does so, the test becomes unreliable because the integrity has not been maintained- it is invalid. Invalid tests are unreliable because no conclusions can be drawn from the test. If Jimmy maintains the integrity of the test, then it becomes valid- thus reliable on the surface.