yes
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They are variables that can take quantitative - as opposed to qualitative values. For example, the colour of peoples' eyes is a qualitative variable, but their age or shoe size are quantitative variables.
no
a descriptive investigation is a scientific ivestigation that collects data which measure or decribe objects or events. it collects qualitative & quantitative data. it includes a question, but no hypothesis ; no variables are manipulated .
Mode is the only measure of central tendency to measure quantitative dataor qualitative data.
Anytime you are able to measure something, it is quantitative data. Qualitative data represents the quality of something which cannot be measured.