MONTH	NO. OF VEHICLES PRODUCED
January	3770
February	3680
March	3300
April	3500
May	3440
June	3640
July	3730
August	3240
September	2900
October	3800
November	4120
December	4540

Source: Vancouver Car Manufacturing Company Ltd, 2000

Arrange the data in ascending or descending order. Group the data/scores into four equal sets as follows, and then indicate the following:

1. the First quartile
2. the Third quartile
3. Range - difference.
4. Interquartile range
5. how do the outputs differ between the four quartile periods. Or how does production in Q.1, then Q.2, then Q.3 and finally Q.4 differ from one another? What does the trend indicate to you? In other words, were there production increases, decreases or stagnation/mixed signals during each of these periods?

3. Calculate moving averages for the following periods:

1. July, August; September
2. August, September, October
3. September, October, November
4. October, November, December

Again, what does the trend in production here indicate to you? How does the trend portrayed by the moving averages differ from that indicated by the quartiles? If there is a difference between the two, suggest why.

MENTION FORMULA