STAT 2040Section 1B – Descriptive StatisticsStudy GuideLower Class limitsUpper Class LimitsClass BoundariesClass MidpointsClass Width3. Picutres of Data4. Measures of CenterMeanAdding all sample (or population) values and divide by number in sample (or population)MedianMiddle value of all data when data are arranged from low to highExcel = Median(data range)ModeValue occuring most frequentlyExcel = Mode(data range)MidrangeHalfway point between smallest and largest datapointNo excel functionWeighted MeanWhat is the BEST measure of center?1.Some definitionsa.Center– Value that indicates where the middle of the data is located.Different definitions of “center”.b.Variation– Measure of how much the values vary among themselvesc.Distribution- The nature or shape of the distribution of data (such as bell-shaped, uniform, or skewed)d.Outliers
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