5) Use log and difference of log transformations in the "airpass" data. Plot "airpass", log of "airpass", and difference log of "airpass" in three different charts, shown in one figure with three grids (you can use mfrow=c(3,1)) 6) Examine whether the difference log of the airpass data is stationary. 7) Run pacf and acf function on the stationary transformed version of the data and apply an ARMA model with the appropriate order to the data. 8) Report the estimated coefficients of the ARMA model and explain whether the estimated coefficients are significant.

Fig: 1