Problem $3(20$ points total, $10$ points each part$)$

Consider the monthly retaile debit card usage in Iceland dataset that is available in fpp$2$

package $($called "debitcards"$).$

$($a$)$ Plot the data and explain what key components $($such as trend, seasonality, etc.$)$ it

has.

$($b$)$ Plot its ACF and also explain how we understand the key components that the data

has on the ACF plot.