The adjusted seasonal indexes presented in Table P-19 reflect the changing volume of business of the Mt. Spokane Resort Hotel, which caters to family tourists in the summer and skiing enthusiasts during the winter months. No sharp cyclical variations are expected during 2007.

a. If 600 tourists were at the resort in January 2007, what is a reasonable estimate for February?
b. The monthly trend equation is = 140 + 5t where t = 0 represents January 15, 2001. What is the forecast for each month of 2007?
c. What is the average number of new tourists per month?

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TABLE P-19 Adjusted Adjusted Month Seasonal Index Month Seasonal Index January February March April May June 120 137 100 September July August 153 151 95 60 47 125 1 October November December 97