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Because the measurement usually requires putting the measurement device in the experiment. Just observing an experiment effects it because you are interpreting the results.
There are a great many factors that affect the degree of accuracy of a measurement. These factors include temperature for example.
The term accuracy describes how far your observation/measurement is from the correct result. Precision describes how repeatable your results are, regardless of their accuracy..
Measuring the weight of any body requires a tool to measure it. A measurement without a tool is an estimate, not a measurement.Measuring the weight of an airplane without a measuring tool cannot be done.
A Qualitative observation a RED carpet a LARGE vase a BROKEN car
Naturalistic Observation is a Psychologist who conducted their observation through measurement.
A scientific description requires accurate measurement and observation, with as much detail as the scientist can manage. Sometimes it is the small details which are the most revealing.
Quantative observation is an observation involving numbers or measurement. Qualitative observation is a type of observation that deals with numbers.
Numerical measurement or observation of numerical relation.
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An observation that deals with a number or amount is called a quantitative observation. An observation that deals with descriptions is called a qualitative observation.