Question: Complete Data 15 - : 95% Cl for 90th percentile 1 : EPA action level 10 - A : observed 90th percentile : Outlier Frequency

Complete Data 15 - : 95% Cl for 90th percentile 1 : EPA action level 10 - A : observed 90th percentile : "Outlier" Frequency 0 - 15 30 45 60 75 90 105 Lead Level (ppb) Source: SAS Blogs Figure 1: Histogram of Complete Data on lead levels collected by MDEQ.Complete Dat." 90th 95% CI for the 90th Percentile Percentile Lead level concentration 18 9 to 43 (ppb) MDEQ Exclusion of 2 Samples 15 - :95% CI for 90th percentile | : EPA action level 10 - A : observed 90th percentile Frequency 5- 15 30 45 60 75 90 105 Lead Level (ppb) Source: SAS Blogs Figure 2: Histogram of Modified Data on lead levels collected by MDEQ.Modified Data g 95% CT for the 90 Percentile Percentile Lead level concentration 12 81029 (ppb)

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