~NeedToKnows

The Elements of Statistics with Applications to Economics and the Social Sciences

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Unformatted text preview: Stuff I Need to Know for Econ 15A-B These questions represent everything you need to know for the upcoming exam (only as far as we have covered in lecture, of course). Items that are bulleted or prefaced with ** are important and useful, but they will not appear on any exams; only the numbered items will be relevant to the exam. 15 A Stuff Chapter 02 1. **What kind of thing is a random variable? 2. Know what the five scales of measurement that we cover, and how to describe them. I.e., what is distinctive about each? 3. How are the five scales of measurement that we cover related to one another (i.e., is one sort of scale always an instance of another sort of scale)? 4. Give two examples of something that would be measured on an absolute scale, and write a sentence or two about why these are good examples of this scale. 5. Give two examples of something that would be measured on a ratio scale, and write a sentence or two about why these are good examples of this scale. 6. Give two examples of something that would be measured on an interval scale, and write a sentence or two about why these are good examples of this scale. 7. Give two examples of something that would be measured on an ordinal scale, and write a sentence or two about why these are good examples of this scale. 8. Give two examples of something that would be measured on a categorical scale, and write a sentence or two about why these are good examples of this scale. 9. Give two examples of something that would be measured with an index, and write a sentence or two about why these are good examples. 10. Give two examples of something that would be measured with a time series, and write a sentence or two about why these are good examples. Chapter 03 11. How would you determine the median of a data set? 12. When is the median an element of a data set? When is it not? 13. Describe how the box of a box-and-whisker plot is constructed. 14. How far out do the whiskers extend? 15. What are the outliers (if any) in a box-and-whisker plot? 16. Describe how to determine the three quartile points and the four quartiles of a box-and- whisker plot 17. Construct a box-and-whiskers plot (by hand) for a relatively small data set, e.g., {3, 4, 3, 2, 1, -8, 4, 3, 2, 0}. 18. What kind of information does a box-and-whisker plot visually display? 19. Give an example of when and how you might use a box-and-whisker plot. 20. How are relative frequency plots different from cumulative frequency plots? 21. Know how to sketch a relative frequency plot and a cumulative distribution plot (by hand) for a relatively small data set, e.g., 2% of students are under 18, 10% are 18, 20% are 19, 25% are 20, 20% are 21, 15% are 22, and 8% are over 22....
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~NeedToKnows - Stuff I Need to Know for Econ 15A-B These...

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