Suppose you are a manager at a ski resort in Utah. The ski resort collects and keeps data on the demand for ski rentals over the past several seasons. Your assistant observes that the demand has a day-of-the-week effect (i.e., demand over a week is highly seasonal or cyclic). He calculates the seasonality factors for all 7 days of the week. The seasonality factors for Monday through Saturday are 0.8, 0.5, 0.4, 0.8, 1.7 and 1.8 respectively. What is the estimate of the seasonality factor for Sunday