# 1.3 Describing Quantitative Data with Numbers.docx - 1.3...

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1.3 Describing Quantitative Data with NumbersMeanTo find the mean of a set of observations, addtheir values and divide by the number ofobservations1.The mean is the “fair share” value2.Tells us how large each observation inthe data set would be if the total weresplit equally among all theobservations1.The bar x symbol refers to the mean of a samplea.Most of the time, the data we’ll encounter can be thought of as a sample fromsome larger population2.When we need to refer to a population mean, we’ll use the symbol (u) pronounced“new”.3.The mean is sensitive to the influence of extreme valuesa.Because the mean cannot resist the influence of extreme observations, we saythat it is not a resistant measure of centerMedianThe median is the midpoint of a distribution,the number such that half the observationsare smaller and the other half are larger1.Arrange in order of size2.If the n is odd, the M is the centerobservation3.If the n is even, the M is the average

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Term
Spring
Professor
AlexandruBelu