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Researchers are planning a study to estimate the impact on crop yield when notill is used in combination with residue retention and crop rotation. Based on data from a metaanalysis of 610 small farms. the researchers estimate there is a 2.5% decline in crop yield when notill is used with residue retention and crop rotation. Suppose the researchers want to produce a 95% condence interval with a margin of error of no more than 3.5%. Determine the minimum sample size required for this study. The sample size needed to create a condence interval estimate depends on the margin of error, the initial estimated proportion, and the condence level. Be sure to use proportions rather than percentages. Round your nal answer up to the nearest whole number