STAT 2040 Lecture : Stat2040 Lec
22 Sep 2014
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O2z1ras: type i errors, type ii errors, and the power of the test (8:11) (http://youtu. be/7me- In hypothesis testing we translate a question of interest into a hypothesis about the value of a parameter, then carry out a statistical test of that hypothesis. Boxplots of lead levels of 126 cairo tra c o cers and 50 o cers from the suburbs: Figure 1: lead levels in the blood of egyptian police o cers. The boxplots seem to show that cairo o cers tend to have a higher blood lead level con- centration. 10203040lead concentrationcairo trafficsuburbssuppose we wish to investigate whether males and females have di erent variability in their scores on the sat exam. Example 0. 2 a mining company has been ordered to reduce the mean arsenic level in the soil on one of its properties to no more than 100 ppm. Suppose an environmental organization strongly suspects that the mining company has not complied with the order.
