(1) In statistics, what is a time series?(2) How are time se

(1) In statistics, what is a time series?(2) How are time series and forecasting related? Where does regression analysis come in?(3) What is deseasonalization? When is it useful to deseasonalize data?(4) What is regression analysis?(5) What is the difference between simple linear regression, and multiple linear regression?(6) For a simple linear regression, what is the importance of the slope?(7) What statistical indicators are used to determine the strength of the relationship between variables?(8) What is the least squares principle