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Question: Surgery and germs. Joseph Lister (for whom Listerine is named!) was a British physician who was interested in the role of bacteria in human infections. He suspected that germs were involved in transmitting infection, so he tried using carbolic acid as an operating room disinfectant. In 75 amputations, he used carbolic acid 40 times. Of the 40 amputations using carbolic acid, 34 of the patients lived. Of the 35 amputations without carbolic acid, 19 patients lived. The question of interest is whether carbolic acid is effective in increasing the chances of surviving an amputation.
a) What kind of a study is this?
b) What do you conclude? Support your conclusion by testing an appropriate hypothesis.
c) What reservations do you have about the design of the study?
1.at what age do babies learn to crawl? does it take longer to learn in the winter when babies are often bundled in
This result applies no matter what the shape of the probability distribution from which the samples are taken. Central Limit Theorem: How Large a Sample?
Calculate the probability that theta hat falls within 0.2 of the theta given the parameter'e true value is 3.0. Calculate the probability of the event asked in Part(a) assuming the sample size is 3 instead of 6.
Suppose that the scores of architects on a particular creativity test are normally distributed. What percentage of architects have Z scores?
Now suppose he says that if he is optimistic about the success of one project, he is likely to be optimistic about the others as well. For your simulation, this means that if one of the probabilities increases, the others also are likely to increa..
What is the null hypothesis for this hypothesis test? What is the alternate hypothesis for this hypothesis test?
In 2013 these scientists counted 175,500 ducks, of which 33,100 were Mallards. Find a point estimate for the proportion of Mallards that were observed during the 2013 winter duck count.
harry phelps owner of harrys clothing cupboard is considering a move from downtown to a new shopping mall. because he
consider the following set of data.19 10 29 52 64 29 85 16 110 59 115 13a calculate the covariance of the set of data.
Find the annual premium. Find the reserve at time 2, assuming the process is at that time in (i) state 0, (ii) state 1, (iii) state 2.
a company has observed that there is a linear relationship between indirect labor expense ile in dollars and direct
A fair coin is flipped 200 times. The random variable X = number of heads out of the 200 tosses.- Is X a binomial random variable? If so, specify n and p. If not, explain why not.
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