You need to first do a line chart to plot the data, identify its pattern $($trend and seasonality$)$ and then use the additive model to decompose the two patterns. Basically, you need to have t for the trend and dummy variables for the seasonality.please tell me step by step how to do a line chart to plot data and basically every step in excel like your talking to a novice tell me what cell to enter what and please tell me what time period T is and were does it go and also how do I exactly create this chart I need everything as step by step as humanly posssible I am a blank slate and I want to know exactly to the detail on how to solve dont assume anything such as If I have my data or anything every expert keeps assuming better yet If I can see an excel with steps that would be the best option