Answer:
To separate salt, sawdust, and iron, use a magnet to separate the iron. Then, add water to dissolve the salt and float the sawdust. Skim off, sieve, or filter the solution to separate the sawdust.
The amount of time a student spent studying for an exam is a quantitative variable because it can be expressed numerically such as 4 hours, and 80 minutes, among other units of time measurement.
Any variable where the data indicate amounts is referred to be a quantitative variable (e.g. height, weight, or age). Any variable where the data represent groupings is referred to as a categorical variable. This comprises categories (like were people placed in a race), rankings (like cereal brands), and binary results (e.g. coin flips).
Variables assessed on a numeric scale are known as quantitative variables, as was covered in the chapter's section on variables. Examples of quantitative variables are height, weight, reaction time, subjective pain rating, temperature, and exam score.
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The use of illegal drugs or the use of prescription or over-the-counter drugs for purposes other than those which they are meant to be used, or in excessive amounts.