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###  Time Sereis Analysis
###  Study Topics for Midterm
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1. Autocorrelation

   What does autocorrelation mean?

   What happens to sample mean if the series is correlated?

   Given a series, how do you directly demonstrate (plot) an autocorrelation of lag 1?

   Definition of sample ACF and sample ACVF

   Given data, how do you check for autocorrelation?

   How do you plot ACF and ACVF in R?

   How do you determine if sample ACF is significant?

   What is the difference between White Noise and IID noise

   Definition of weak stationarity
   How do you visually check for stationarity?

   Random Trend. Give an example.
   Deterministic Trend. Give an example.