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blocking, precision - Noise Interference Noise Random...

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1 Noise & Interference Interference Undesirable deterministic trends. e.g. 60 Hz interference, daily temperature cycle Æ Randomization plays an important role in reducing interference. The values of the independent control variable are chosen in random order. Æ Blocking also plays a role. Known interfering variables are held fixed. Example: crops grown in different fields, paint on different surfaces. Noise Random variation of the measured signal due to e.g. variations in 1) individual samples (e.g. sizes) or 2) measurement conditions (e.g. probe placement). Example Determination of biggest potato variety. You have 3 varieties of potatoes to test and 4 farms that can be used for planting. At the end of the growing season, potatoes are dug up and weighed. Noise : This comes from variations in the individual potato weights – there is a Gaussian distribution around an average. You need to weigh enough potatoes of each type to get a good estimate of the (actual) average value. Other random variations will also contribute to noise, such as how much dirt or stem material is on the potato.
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