STA_100_Winter_2011_Midterm_Exam_Solutions

# STA_100_Winter_2011_Midterm_Exam_Solutions - STA 100:...

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0.5 1.0 1.5 2.0 2.5 1 2 3 4 Histogram of Toxin Levels Toxin level (mg) Frequency 0.0 0.5 1.0 1.5 2.0 2.5 Boxplot of Toxin Levels Toxin level (mg) Figure 1: Histogram (L) and Boxplot (R) of the same toxin data (described below). Note that the ‘bins’ of the histogram are very narrow, which is why they look like vertical lines. 1. Hired by a local lab, you are asked to analyze some data about toxin levels in the human blood- stream. You have data (blood toxin levels, in mg) for 100 individuals. Figure 1 shows a histogram (left) and a boxplot (right) of the data. (a) (2 points) What type of distribution is this? Right-skewed. (b) (4 points) Using only one of the graphs , estimate the mean and median of the data. State which graph you used (boxplot or histogram). The median is roughly 0.35mg, the mean is roughly 0.5mg. It is easier to use the boxplot here, the median can be read directly of the y - axis, and the mean can be estimated by using the right-skew property that mean > median. You do not need perfect eyesight, as long as your guess is plausible.
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## This note was uploaded on 01/17/2012 for the course STAT 100 taught by Professor drake during the Fall '10 term at UC Davis.

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STA_100_Winter_2011_Midterm_Exam_Solutions - STA 100:...

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