非常急!!幫幫忙!The difference between qualitative and quantitative

Qualitative variable means the parameters that not expressed in number, but names or labels such as sex: F or M and income level: High, medium or low or colour: red, blue and green. On the other hand, quantitative variables could be expressed in measurable number, for examples: height, weight, number of people employed. This data can be further classified as discrete and continuous.
Population is a collection of data from all the members with a particular interest. While sample is a subset of pouulation, which included only part of the population. As we do not have sufficient resources to get the data from the whole population, we must have a fair and reasonable to choose a sample from the whole population. The methods in selecting the sample is called sampling. There are many kinds of sampling: stratified and simple random samplings.