Seasonal indices, Calculating SI, de-seasonalising data. Turbo charge with the TI-nspire Widget

This video covers the basic process of calculating seasonal indices using coffee shop sales over a period of three years. Once the data has been de-seasonalised, linear regression is used to predict future sales. The entire process is then completed in a few seconds using a powerful and free widget on TI-nspire. A free worksheet is available to follow along with the video. The worksheet and Widget can be downloaded from the Texas Instruments Australia website: https://education.ti.com/en-au/profes... Search: Victoria - General Mathematics - TI-Nspire