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A prominent oncologist decides to conduct a randomized trial, in which his patients are randomized to either the current therapy or a new treatment. If the mortality rate on the current therapy is 8% and the mortality rate for patients on the new treatment is 4%, how many patients would he need to treat to prevent one death?
A researcher is interested in whether or not hours studied is different for boys and girls. Is there a significant difference between the two groups?
The mean time between failures is found to be 322.4 hours for a sample group. assuming that s= 45.0 hours, find the 99% confidence interval for the mean time between failures for all such radios.
the probability that sammy makes his own lunch is 0.75. the probability increases to 0.8 if he made his own lunch the
Department store accepts three types of credit cards, MasterCard, Visa, and their own store card. Charges are normally distributed. A random sample of 18 credit card purchases included 6 MasterCard
question the following table gives a two-way classification based on gender and employment status of the civilian
a company purchases shipments of machine components and uses this acceptance sampling plan randomly select and test 20
A company's headquarters is located in downtown Chicago. The company is interested to know the mean driving time of its employees if they require their employees to start working at 6:00 am. Fifty employees are randomly sampled over four weeks and..
for a parallel structure of identical components the system can succeed if at least one of the components succeeds.
a boiler has five identical relief valves. the probability that any particular valve will open on demand is0.90.
milk delivery at a local supermarket consisted of 50 liter-sized containers of which 3 were spoiled. if you purchase 2
when circuit boards used in the manufacture of compact disc players are tested the long-run percentage of defectives is
Discuss the issue of statistical power in non-parametric tests (as compared to their parametric counterparts). Which type tends to be more powerful? Why
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