https://www.statista.com/statistics/299153/apple-smartphone-shipments-worldwide/

using the link above:

1. Plot iPhone sales over time.

2. Compute the moving average for sales, using an appropriate interval, and plot the smoothed data over time.

3. Run an appropriate regression model to capture the product life cycle phenomenon on the smoothed data and report the regression model coefficients.

4. Based on the above regression, estimate the corresponding Bass Model values for M, P, and Q.

5. Capture seasonality using a dummy variable and run an alternate regression model on the dataset without smoothing and report the regression model coefficients.