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An office building in New York uses thousands of fluorescent light bulb each year. The brand of bulb it currently uses has a mean life of 900 hours. A manufacturer claims that its new brand of bulbs, which cost the same as the brand the office building currently uses, has a mean life of more than 900 hours. The university has decided to purchase the new brand if, when tested, the test evidence supports the manufacturer's claim at the .05 significance level. Suppose 64 bulbs and the sample has a mean of 920 hours and a standard deviation of 80 hours.
1. Luis developed which theory to describe the dispersion of European settlers in the Northern Mexico during the sixteenth century based on following river valleys?
1. Consider your answer to Are the events A1: a worker dies, and A2: the worker is exposed to a lethal dose of radiation independent?
a sample of 12 radon detectors of a certain type was selected and each was exposed to 100 pcil of radon. the resulting
At the 0.025 level of significance, test whether customer size might be independent of estimation accuracy.
A fast food restaurant executive wishes to know how many fast food meals teenagers eat each week. What is the minimum sample size required to create the specified confidence interval
the author recorded actual temperatures along with temperatures that were predicted 5 days earlier. results are listed
If n=20, ¯x(x-bar)=32, and s=4, find the margin of error at a 99% confidence level
Ground motion of earthquakes. In the Journal of Earthquake Engineering (November 2004), a team of civil and environmental engineers studied the ground motion.
Question 1: Of the following, which is not required to properly use a round bottom flask of a simple distillation setup?
10 cartons are taken at random from an automatic filling machine.The mean net weight of the carton is11.8 kg and standard deviation of 0.15kg. Does the sample mean differ significantly from the intended weight of 12kgs?
To find the velocity of a cart on a horizontal air track, a student mea-sures the distance d it travels and the time taken t as d = 5.10 ± 0.01 m.
What is the probability that there will be more than 6 accidents in a 1-hour period? What is the probability that there will be at most 2 accidents during the 2-hour busy period on a particular day?
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