Answer Happy

1 QUESTION 3 (36 MARKS) The following data represents the sales (R100 000) of a beer producer for each quarter from 1990 to 1993: Quarterly sales Year 11 IV 1990 1991 24 1992 41 1993 35 24 21 48 24 19 25 38 = | | | 27 22 40 31 23 23 Use the data provided above to determine the following: 3.1) Represent the time series graphically, (4 marks] 3.2) Determine the least squares trend line equation for this data set, and represent it graphically. [8 marks) 3.3) Use the trend line equation obtained to estimate sales for the first term or 1989 and the second term of 1994 (2+2 marks] 3.4) Calculate centred four-quarterly moving averages and represent them graphically. [8 marks) 3.5) Calculate the typical seasonal index and represent these indices graphically on the same axes constructed in Question 3.4. [12 marks)