A bank had 38,091 ATM network transactions at its cash machines in January and had 43,182 in February. The seasonal indices are 0.925 for January and 0.986 for February.
a. By what percent did ATM transactions increase from January to February?
b. By what percent would you have expected ATM transactions to increase from January to February?
c. Find seasonally adjusted transaction levels for each month.
d. By what percent did ATM transactions increase (or decrease) from January to February on a seasonally adjusted basis?