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Hypothesis Testing for a t-test. Monitoring Lead in Air. Listed below are measured amounts of lead in micrograms per cubic meter or ug/m to the third power in the air. The EPA has established an air quality standard for lead of 1.5 micrograms per cubic meter or ug/m to the third power. The measurements shown below constitute a simple random sample of measurements recorded at bed 5 of the world trade center site on different days immediately following the destruction caused by the terriost attact of September 11, 2001. After the collapse of the two Word Trade Center building there was a considerable concern about the quality of air. Use a 0.05 significance level to test the claim that the sample is from a population with a mean greater than the EPA standard for 1.5 ug/m to the third power. Show all steps null and alternate hypothesis, diagram, critical value, test statistic. Reject or do not reject conclusion.
1. a local cable tv company with customers in 15 towns is considering offering high-speed internet service on its cable
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the mean height of 8 year old girls in my daughters school is 125 cm with a standard deviation of 0.3 and the height
An anatomy teacher hypothesizes that the final grades in her class are distributed as 10% A's, 23% B's, 45% C's, 14% D's, and 8% F's. At the end of the semester, she has the following grades.
There are two major tests of readiness for college, the ACT and the SAT. ACT scores are reported on a scale from 1 to 36. The distribution of ACT scores for more than 1 million students in a recent high school graduating class was roughly normal with..
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The changing ecology of the swamps in Louisiana has been the subject of much environmental research. One water-quality parameter of concern is the total phosphorous level.
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