STAT 101 Chapter Notes - Chapter 2: Interquartile Range, Box Plot, Quartile
6 Apr 2016
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Mean: average (refer as x bar ); balance point of the data. X bar: mean of the sample of the data. The median: the formal diversion of the midpoint. How to ind the median (odd = n+1)/2 ) If the number of observaion is even, median equals the aver of two middle observaion. Skewed distribuion: median beter; mean is afected by outlier and skewness. Symmetric distribuion: mean = median; but mean is beter cuz its addiional mathemaical properies. Q1 & q3, q2 = the median (m) Q1: value that has approximately 25% of the observaion in the ordered data set below it and 75% above it. Q3: value that has approximately 25% of the observaion in the ordered data set above it and. How to compute q1 and q3 (n is odd) If the num of observaion is odd, leave the overall out median out of the computaion of the quariles. Order the data & ind the median.
