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Does a car speedometer that is always five mph too low have a problem with reliability...

Does a car speedometer that is always five mph too low have a problem with reliability or validity? Does a thermometer that varies +/- 2 degrees but on average gives you the right temperature have a problem with reliability or validity?

Math   Statistics-And-Probability   
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Answer #1

Definitions-

  • Reliability - A measurement is considered to be a reliable one if its application on the same object to measure for a number of times produces same (almost) results. It refers to the degree to which scale produces consistent results.
  • Validity - A measurement is considered to be a valid one if its application on a object produces actual (almost) value. It is the extent to which a measurement is well obtained and likely corresponds accurately to the real value.

Answers-

Car speedometer that is always five mph too low is reliable and so it has a problem with validity.

Thermometer that varies +/- 2 degrees but on average gives the right temperature is valid and so it has a problem with reliability.

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