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How can we know if two means are significantly different?
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- For a confidence interval for a mean to be valid, certain assumptions must be met. From the following list, choose ALL that are always necessary.Observations must be independentObservations in the sample(s) must be representative of the population form which the sample is drawnThe sample data must be normally distributedThe population data must be normally distributedThe sample(s) must be greater than 25.Either the population data must be normally distributed or the sample(s) size(s) must be equal to or greater than 25.