MTH 110 Quiz: Chapter 4 Test Review
1 Mar 2017
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Mean: average, : sample mean, : population mean. Median: middle of ordered data set. Mode: what occurs most often, with quantitative data, mode can tell us about shape, for qualitative data, mode is the only measure of center we can use. Weighted average: special case of the mean, accounts for variation in relative importance of data values, each data value is assigned a weight & the weighted mean. Weighted mean= [sum(each data value*weight)]/sum of all weights. Relationship between mean & median based on shape of distribution (normal, skewed right, skewed left) Outliers: change mean more than they do median, why some things are skewed. When to use appropriate measure of center: if distribution: symmetric, we describe the center" of the data w/ the mean, if distribution: skewed, we describe the center" of the data w/ the median. Tells us over how many values our data is spread, easy to calculate. Very affected by outliers: iqr (interquartile range):
