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Suppose you conduct an investigation to find out the types of soil in your neighborhood why would it be helpful to test soil at 10 different locations instead of just a single location

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Diatonic254

This is because a sample is supposed to ideally represent the whole population from which it was taken. Taking samples from different location within the population ensures that they are no bias in the sample. Each part of the population should be well represented in the sample so that the conclusions drawn from the sample represent the properties of the whole population.