Quantitative observations involve quantinty or numbers .
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Such observations are said to be quantitative.
Quantitative observations (as opposed to qualitative observations, which do not include numbers)
Quantitative observations are the data collected in an experiment, mostly numbers. Qualitative observations would usually include written answers to analysis questions.
"The professors observations on the insect population in Brazil were all quantitative."
Quantitative measurements are those which involve the collection of numbers. It is the opposite of qualitative data which are observations. For example, if you were interested in looking at height. Quantitative measurements would be taking an accurate measurement of everyone. Qualitative data would be looking at the person and putting them into a category of 'tall,' 'medium,' 'short.'