Mixed Questions

Question 1: Draw the following time series graph for sales for a tuck shop

	2001	2002	2003
Jan -> June	120	132	146
July -> December	140	151	x

a) Why is a two-point moving average appropriate
b) Find all the possible moving averages and plot these on your graph
c) Use this to estimate the missing data value

Question 2: The following represents the sales of a shop selling video recorders

	Jan -> Apr	May -> Aug	Sep -> Dec
2004	302	200	350
2005	250	180	299

a) Draw the time series graph for this graph. Include 2006 on your x-axis
b) Explain what the graph appears to be telling us and give a possible reason for this
c) Why is a three point moving average appropriate
d) Work out the moving averages and plot these on the graph along with an appropriate line of best fit
e) Use this to work out an estimated sales value fot The final third of 2006