The following data (stored in Credit) are monthly credit card charges (in millions of dollars) for a popular credit card issued by a large bank (the name of which is not disclosed, at its request):

a. Construct the time-series plot.
b. Describe the monthly pattern that is evident in the data.
c. In general, would you say that the overall dollar amounts charged on the bank's credit cards are increasing or decreasing? Explain.
d. Note that the December 2009 charges were more than $63 million, but those for February 2010 were less than $40 million. Was February's total close to what you would have expected?
e. Develop an exponential trend forecasting equation with monthly components.
f. Interpret the monthly compound growth rate.
g. Interpret the January multiplier.
h. What is the predicted value for March 2010?
i. What is the predicted value for April 2010?
j. How can this type of time-series forecasting benefit the bank?

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