Maths Statistic Course Work Help........................Watch
How To Select Datas Randomly(120) In 1183 Datas(in Proper Mathamatic Way)
Advantages of this method is that it is non-biased and quick and easy to do. Disadvantage is that it is not always represntative of the population. For coursework if you mention in the 'improvement' section that it is not representative and cluster sampling would have been better but more time consuming this should do.
i.e. if there are significant repetitions.