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It means that every member of the population has the same probability of being included in the sample.
It means that the observations are all close to their mean value.
According to the Central Limit Theorem if the sample size is large enough then the means will tend towards a normal distribution regardless of the distribution of the actual sample.
(of an adjective or adverb) expressing a higher degree of a quality, but not the highest possible (e.g., braver; more fiercely).Positive Comparative Superlativesimple simpler simplestsilly sillier silliestwhite whiter whitestclear clearer clearesteasy easier easiest