Time Series Analysis

Describe what role Exploratory Data Analysis (EDA) has in the application of time series modeling. Include:
(a) Why is testing for a normal distribution important?
(b) Why is testing for skew and kurtosis important?
(c) What role does hypothesis testing play?
(d) What distribution is used for constructing confidence intervals?
(e) Why decompose (STL) a time series?
(f) When do we use EDA?