Cannister, Inc., specializes in the manufacture of plastic containers. The data on the monthly sales of 10-ounce shampoo bottles for the past 5 years are as follows:
a. Using the multiplicative seasonal method, calculate the monthly seasonal indices.
b. Develop a simple linear regression equation to forecast annual sales. For this regression, the dependent variable, 
, is the demand in each year and the independent variable, 
, is the index for the year 
, and so on until 
for year 5).
c. Forecast the annual sales for year 6 by using the regression model you developed in part (b).
d. Prepare the seasonal forecast for each month by using the monthly seasonal indices calculated in part (a).
