Answer the Questions Assignment Example | Topics and Well Written Essays - 500 words

Answer the Questions - Assignment Example Random error occurs within the experiment itself. Bias is systematic errors in an epidemiologic study that brings an incorrect estimate of the connection between exposures and outcomes. Bias can be divided into categories that is the selection, and information bias. Selection bias occurs when selection into a study gives results that are different from what is expected if the entire population was involved (McDaniel and Roger, Pp 15). If an individual involves the whole population and collects accurate data, then an individual could compute the correct association. If sampling is not represented by outcome distribution of the whole population, the measures of connection will be biased. A typical example is a jar filled with marbles of 500 red and 500 blue that are mixed randomly. If a person pulls out 50 at random, he is likely to get 25 red and 25 blue. It is also possible to get 27 red and 23 or 29 blue and 21 red. An individual can also get 40 red or 10 blue, which is highly unlikely because each is likely to be proportioned (McDaniel and Roger, Pp 35). This is a form of random error. Systematic error might occur when the blue marbles are near the top, and the reds are at the bottom. When an individual pulls from the top, he is likely to get 37 blues and 13 red because an individual is not getting a sample that represent the whole jar. Behaviour targeting is the act of targeting users based on their behaviour of using the internet. This behaviour is used to target online ads, but the techniques can also be used to target products. Behavioural targeting is used to target the people that matter most. Behaviour targeting only needs to give the audience the right information and the message they need. It divides users according to the content they watch on the sites (McDaniel and Roger, Pp 56). They are also targeted with a message that is appropriate to that segment. Behaviour targeting is deployed in two ways, which are on-site and network targeting.