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A proposed bridge is supported at two ends and one a center pier. Although the design allows for relative settlements of the foundations, the engineer needs to keep these settlements within limits. Settlements caused by the sum of numerous dead loads and impacts of moving vehicles are assumed to be normally distributed, with the variability arising from the effects on the soil by the foundation. By correlating with test results from similar structures and soil conditions, estimates of the settlements were made as follows
Bridge
Mean Settlement (in)
Std.Dev. (in)
Left end
3
1
Center pier
5
1.5
Right end
If both left and right end foundations on the banks are stabilized so that their settlements are negligible, specify the maximum allowable relative settlement of the center pier for the design engineer so that any maximum relative design settlement would exceed this value with a probability of only 0.0001.
A large computer company claims that their salaries are normally distributed with mean $50,000 and standard deviation 10,000. What is the probability of observing an income between $40,000 and $60,000?
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Suggest one psychological research question that could be answered by each of the following types of statistical test:
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The director of Heating and Oil at Mitchell Brothers Company is concerned about the high cost of home heating oil being offered to their customers for the upcoming Fall season in Boston, MA. The company has no possibility of modifying the oil pri..
A study sponsored by American Express Co. and the French government tourist office found that old American stereotypes about French unfriendliness weren't true.
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