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Mount St. Helens is an active volcano in US, which had a strong eruption on May 18, 1980. The region around the volcano became a national park in 1982. Since the eruption, the size of the fish in Spirit Lake at the bottom of the volcano seems to have increased. In 2010, a sample of 30 rainbow trouts had an average weight of 2.3 lbs and a sample standard deviation of 4 lbs. Is there significant evidence that 30 years after the eruption, the average weight of the trouts is higher than the pre-eruption average weight of 1.9 lb? (Assume that the fish weight has a normal distribution.)
A random sample a 16 Google managers yield the following information on annual salaries. The sample mean is $69,000, with a sample standard deviation of $4,000. What is the mean salary of all Google managers?
Tests and CIs The P-value for a two-sided test of the null hypothesis H0:m = 15 is 0.03. (a) Does the 99% confidence interval for m include 15? Why or why not?
An insurance company handling malpractice cases is interested in estimating the average amount of claims against physicians of a certain specialty.
what is the probability of having the same number when rolling two dices? what is the probability of having at least
Find out your yearly car insurance cost. If you don't have a car, find out the yearly cost for a friend or relative.
-Explain at least two (2) possible reasons for the differences between the results of exploration and trade by the Chinese and by the European states.
The accompanying data on number of minutes used for cell phone calls in 1 month was generated to be consistent with summary statistics published
(i) What is the probability that a sample of 100 students, selected with replacement, will contain at least one red-haired student?
What were the significance's of the voyages of Columbus, da Gama and Magellan?
compare the mean for the heights of males and the mean for the heights of females in these data. compare the values and
A random variable X has P{X = 0} 0.9. Given X ≠ 0, it has a uniform distribution between 5 and 15. Thus, E(X) = 1. Obtaining uniform random numbers as instructed at the beginning of the Problems section, use simulation to estimate E(X).
Your firm is contemplating the purchase of a new $800,000 computer-based production system. The system will be depreciated straight-line to zero
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