GB715 Midterm Review

Chapters 1-3 Study Questions

1. What the difference between mean and median - affected by outliers
2. How to poke holes in a study:
   1. Correlation does not imply causation
   2. Name some possible lurking variables
   3. Offer a better alternative
3. Qualitative vs quantitative
4. Which data viz choice is appropriate for a given statistic
   1. Histogram not appropriate for a qualitative stat
   2. Pie charts show how the whole is subdivided
5. Using a pivot table
6. How do you prove an outlier?
   1. Chebyshev rule? 75% of values must lie within two standard deviations of the mean and 89% within three standard deviations.
   2. Z-score = (x-xbar)/s
7. Relative variability? Coeficient of variation CV = (s/xbar)*100

More study Questions

1. Dependent vs independent variable
2. Predict something based on given data
3. How do you interpret R-sqared
4. What is residual? The error between the estimate according to the model and the observed (ground truth)

Answer tips

• Define all terms given
• Compare and contrast concepts, give pros and cons
• Less, same or more survey questions are QUALITATIVE, not quantitative
• Descriptors/labels aren't statistics and aren't variables