Sample size calculations for marketing testing

http://www.lucidview.com/sample_size.htm

Sample size is an important issue in marketing testing because it has such a large impact on the validity of your results and is so often misunderstood. Without sufficient sample size (i.e., sufficient data), your test will be meaningless–little more than a guess. Greater sample size increases your confidence that any change in response or sales is a real difference and not just random chance.

BBC NEWS | Technology | Illegal ad system scrutinised

http://news.bbc.co.uk/2/hi/technology/7331493.stm

From the page: “Technical analysis of the Phorm online advertising system has reinforced an expert’s view that it is “illegal”.

The analysis was done by Dr Richard Clayton, a computer security researcher at the University of Cambridge.

What Dr Clayton learned while quizzing Phorm about its system only convinced him that it breaks laws designed to limit unwarranted interception of data.”