STAT 2040 Lecture Notes - Lecture 9: Blood Lead Level, Type I And Type Ii Errors, Null Hypothesis
30 Mar 2017
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Responsible for up to the end of this lecture for the next midterm. Hypothesis testing for a single mean u (true mean of the population, almost always unknown) H0: u = uo example, test the hypothesis that u = 5 against one of. Ha: u = uo/ most often use the two sided alternate hypothesis. X - uo something in the tails says there is evidence against the null hypothesis, something in the standard normal distribution, there is not sufficient evidence against the null hypothesis. 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: n o i t a r t n e c n o. Figure 1: lead levels in the blood of egyptian police o cers.
