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A procedure removes kidney stones. The treatment is successful if stones were reduced to less than 2 mm after three months. Procedure successful for 301/350 patients that did the treatment. The traditional open surgery has a success rate of 80%.
a) Is there significant evidence that the success rate of procedure in treating kidney stones is different than the success rate of open surgery? Make a null hypothesis and an alternative hypothesis and find the corresponding p-value. Use α = 0.01
an experimenter suspects that a certain die is loaded that is the chances that the die lands on different faces are not
The sample proportion p^ will have a distribution that is approximately Normal. Give the mean and the standard deviation of this Normal distribution.
Explain the principal benefit of a market-neutral long-short portfolio. What risks are inherent in such a portfolio that a long-only equity portfolio lacks?
Forecast the mileage for next year using 2-year moving average. Compute the forecast for year 6 using Naive method.
In a particular satellite, 4 such components are placed in parallel. If the probability of a component operating successfully is 0.9, what is the probability of the system functioning?
In a study of maternal cigarette smoking and bone density in newborns, 77 infants of mothers who smoked has a mean bone mineral content
Write a Lex program that examines the words in an ASCII file and lists the ten most frequently used words. Your program should ignore case and should ignore words that appear in a predefined "don't care" list.
The? quality-control manager at a compact fluorescent light bulb? (CFL) factory needs to determine whether the mean life of a large shipment of CFLs is equal
Discuss the difference between sampling bias and measurement bias. Give exam, ples of statistical studies in which each is an important consideration.
The histograms show the distribution of the estimated numbers of hours per month spent on social services for project boys (left) and project girls (right).
Let E3 be the event that a heart is drawn. Let E4 be the event that a 3 is drawn. Are E3 and E4 independent events? Why or why not?
Using the t tables, software, or a calculator, estimate the critical value of t for a 95% confidence interval with df = 7.
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