A continuous number can take any value, such a 1.234, or 3.5, or 10.11. Height is usually a continuous quantity (even though height cannot be negative, it is still continous). Time is also usually considered continuous.
Whereas a discrete number must take certain values, such as (1, 1/2, 3, 4, 5 etc. . for shoe sizes) or (1, 2, 3 etc.. for amount of people). Since you cannot get .2 of a person, or -3 pencils or something equally illogical .
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the difference
Managing the quantity of labour used
estimation is to think of an answer before measuring the quantity and approximation is to round off.
They are both very good forms of research the main difference is the method in which the research is carried. In quantitative research there are more statistics involved. Everything is more mathematical in a sense, you're focused on the quantity. In qualitative research there is a focused on the quality of the work the questioning as to why things happen.
Zero is a number (a scalar quantity without unit) while zero vector (or null vector) is a vector quantity having zero magnitude and arbitrary direction.