A recent survey in Kenya reported in Transparency International’s 2010 Global Corruption Barometer Report yesterday indicated that ninety two percent of Kenyans believe that the police force is the most corrupt institution in Kenya. The index which has similar ratings from around the globe, put the police at 4.6 on a scale of one to five – with five being most corrupt. It also reported that 45 percent of Kenyans had given a bribe to a public official in order to access services.
I found the results of the survey interesting, and performing surveys myself, I looked at their survey methodology. The survey, which was performed by Synovate, had a sample size of 1,000 Kenyans, which is substantially enough to obtain a significant result assuming that the population was randomly selected and representative of the population. The sample, however, was performed by computer-assisted telephone interviewing (CATI). While an excellent tool in developed countries where most people have telephones, its use in Kenya puts into question the sample’s ability to represent the population since many Kenyans do not personally have a phone.
So instead of saying the sample is representative of the general population, Transparency International should say that it is representative of the population in Kenya with telephones.