A linear trend equation for sales of the form

Qt=a+bt

was estimated using annual sales data for the period 2003 - 2010 (i.e.,t= 2003, 2004, ..., 2010). The results of the regression are as follows:

Dependent Variable: 2 F-ratio p-value on F

Observations: 8 0.7034 14.23 0.0093

Variable Parameter Estimate Standard Error t-ratio pvalue

Intercept -23,024,200 8,122,205 -2.83 0.0298

t 12,045 6,075 1.98 0.0947

Why would certain data be seasonally adjusted?

Select one:

a.If sales were expected to be down each season (summer, fall, winter, and spring) during a particular year.

b.If, historically, there were predictable upward or downward trends in the data during winter or summer months.