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Afarmer wants to determine if a new fertilizer gives a better crop yeild than her old fertilizer. she spreads the old fertilizer in field a, which crop had a brand new irrigation system. she spreads the new fertilizer in field b, which has a irrigation system that will be repaired next season. at the end of growing season, field a has a better yeild. the farmer determines that her old fertilizer is the better fertilizer. this an example of which of the following a. cultural bias b. personal bias c. data presentation error d. experimental bias
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