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Hong Kong's Mai Po marsh is an important migratory stopover for more than 100,000 birds per year from Siberia to Australia. Many of the bird species that stop in the marsh are endangered, and there are no other suitable wetlands to replace Mai Po.
Currently the Chinese government is considering building a large housing project at the marsh's boundary, which could adversely affect the birds. Environmentalists estimate that if the project goes through, there will be a 60% chance that the black-faced spoonbill (current world population = 450) will not survive.
It is estimated that there is a 70% chance the Chinese government will go ahead with the building project. What is the probability of the species' survival (assuming no danger if the project doesn't go through)?
The marks on a statistics midterm test are normally distributed with a mean of 78 and a standard deviation of 6. What is the probability that a class of 50 has an average midterm mark that is more than 75?
Estimating the individual score using normal distribution and find the minimum SAT score needed to be accepted?
a doctor studies pain levels in 88 patients to see if their chronic arthritis pain has been changed by a holistic
Then explain your answer to someone who has never had a course in statistics (but who is familiar with mean, standard deviation, and Z scores).
Printed circuit cards are placed in a functional test after being populated with semiconductor chips. A lot contains 140 cards, and 20 are selected without replacement for functional testing.
The mean life time of the sample of 160 tires will be less than 39,000 miles? Interpret the probability in terms of the truth of the manufacturer's claim.
Let {Xn } be a submartingale. Show that EXn is a nondecreasing sequence of numbers, and give an example to show that Xn - EXn is not necessarily a martingale. Hint: Consider the uniqueness in the Doob decomposition.
The Skateworld Company operates ice rinks in several major cities throughout the United States. During each session of open skating, one customer is selected at random to receive a free pass for a future open skating session.
1 a paired difference experiment consists of n 18 pairs d5.7 and s2d 256. suppose you wish to detect ?dgt 0.a.
same setting as in question 10 still sampling with replacement what is the probability that exactly two of the three
What is the smallest number of consumers that Timex can survey to guarantee a margin of error of .05 or less at a 99% confidence level and calculate the intervals correctly
The population is 500 pounds. At a 80% level, how many elephants need to be weighed so the average weight will be accurate to within 350 pounds?
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