# Scientific Methodology

What is the difference between qualitative and quantitative data? Provide an example of each type.

What is a null and alternative hypothesis?

What is a variable? What are independent and dependent variables?

What is the difference between population and sample? When would you want to use a sample? How would you go able obtaining a sample?

What is the difference between probability and non-probability sampling? Which sampling method would strengthen the research design? Why?

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#### Solution Preview

Qualitative data are observations corresponding to a qualitative variable which gives classification of individuals based on some attribute or characteristic. Quantitative data are observations corresponding to a quantitative variable which provides numerical measures of individuals. For example, male and female are qualitative data, temperatures of 7am and 9pm are ...

#### Solution Summary

The difference between qualitative and quantitative data are determined. Independent and dependent variables are given. The expert defines null and alternative hypothesis.