For Exercises 13.18 to 13.20, see pages 670671; for 13.21 to 13.23, see page 677; for 13.24, see page 679.

Question 13.21

13.21 Monthly warehouse club and superstore sales.

Consider the monthly warehouse club and superstore sales series discussed in Examples 13.15 and 13.16 (pages 671674). Using the trend-and-season fitted model shown in Example 13.16, provide forecasts for the seven remaining months of 2014.

13.21

For June: $36,086.18. For July: $36,196.93. For August: $36,901.43. For September: $34,298.92. For October: $36,075.18. For November: $38,743.68. For December: $45,161.43.