(iV) (Vi) What is the difference between F(t) and F(t+4)? [Note: F(t) represents the forecast for time 't' calculated by the regression prediction equation? Similarly, F(t+4). Since there are 4 seasons, you can answer this question] Forecast the number of customers that will visit the store in each of the next four periods (t: 21, 22,...). Show how you calculate these forecasts. Provide the 90% prediction interval for the forecast of t=23 in question (v)