The American Meteor Society maintains a running fireball-tracking system. All reports are analyzed and grouped according to several variables. In 2012, there were 2302 fireball reports, and 590 of...


The American Meteor Society maintains a running fireball-tracking system. All reports are analyzed and grouped according to several variables. In 2012, there were 2302 fireball reports, and 590 of these were confirmed by 2–5 witnesses. As of August 2013, there were 507 reports and 142 were confirmed by 2–5 witnesses. Assume the samples are independent. Is there any evidence to suggest that the proportion of fireball reports that are confirmed by 2–5 witnesses is different for these two time periods?


Benzene, toluene, ethylbenzene,
m-, p-xylenes, and
o-xylene are volatile organic compounds that are found in residential environments and can cause severe health problems, for example, dizziness, tremors, eye, ear, and throat irritation. The Canadian Health Measures Survey was administered to more than 5000 individuals in order to predict the presence of these compounds. Suppose a random sample of these respondents was selected, and the concentration of toluene was measured in each residenceThe results are given in the following table.


Assume all three underlying populations are normal, with equal variances. Conduct the appropriate hypothesis tests to determine which pairs of population mean toluene levels are different.in each test.



May 04, 2022
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