A valid measurement instrument is always reliable, but a reliable measurement instrument may not always be...
A valid measurement instrument is always reliable, but a reliable measurement instrument may not always be valid.” *** comment on this statement please***
Homework Answers
For evaluating the measurement tool their are two different criteria :
1.Validity : It is the test measure which we actually wants to measure.
2.Reliability : It should be done with the accuracy of a measurement procedure.
Validity is more critical than reliability in measurement. If the measurement instrument measures the concept which is supposed to be measure are reliable instrument. But the reliable measurement instrument is not always valid.
Reliability is about consistency in the results but validity requires accuracy in measurement.
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A valid measurement instrument is always reliable, but a
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MEASUREMENT Reading a measurement from an analog Instrument What is the voltage this voltmeter is measuring? Be sure your answer has a reasonable number of decimal places normal magnify 010 0.2 You can click on the other tab to see a magnified view. * ? Explanation Check 2020 McGraw H o cation. All Rights Reserved Term UITHUAT MEASUREMENT Reading a measurement from an analog instrument What is the voltage this voltmeter is measuring? Be sure your answer has a reasonable...
Problem 4: Instrumental Variables 4a. What are the two requirements for a valid instrument? We're interested in estimating B, in Wage, BoBEducation,+ u but we have a problem with omitted-variable bias. Instrumental variables can potentially help. 4b. As we've discussed, we need an instrument for (endogenous) education. Do you think the number of children would be a valid instrument? Explain why it passes/fails ech of the two requirements for a valid instrument 4c. Which estimates would you trust more-OLS or...
The "best" result is always associated with the measurement with the smallest uncertainty. Measurement B has half the standard uncertainty of measurement A. Therefor e our 68 % coverage probability is associated with a smaller interval (83.44 g o 83.56 g) for measurement B than measurement A (83.38 g to 83.62 g). In other words we have better knowledge about the value of the measurand from measurement B, since we have the same coveroge probability associated with a norrower interval....
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