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CT (computerized tomography) scans can detect lung cancer very early, while the disease is still localized and treatable by a surgeon-although the efficacy of treatment is unclear. Henschke et al (2006) found 484 lung cancers in a large-scale screening program, and estimated the 5- year survival rate among these patients as 85%. Most of the cancers were resected, that is, surgically removed. By contrast, among patients whose lung cancer is diagnosed when the disease becomes symptomatic (e.g., with persistent cough, recurrent lung infections, chest pain), the 5-year survival rate is only about 15%. Do these data make a case for CT screening? Discuss briefly.
let x be an exponentially distributed random variable such that p x gt 3 0.4. find
He is equally likely to select any. Billy leaves last and takes the one remaining hat. Let x be the number of cowboys who end up with the correct hat.
What can we say with 99% confidence about the maximum error, if we use the sample proportion as an estimate of the true proportion of claims filed against this insurance company that exceed $1,200?
a gasoline tank for a certain car is designed to hold 15 gallons of gas. suppose that the actual capacity of a randomly
Based on the scatter diagram, does there appear to be any relationship between the number of assemblers and production? Explain.
Should the hypothesis of equal population means be accepted or rejected at the 5% level of significance?
the pulse rates for 13 adult women were as follows. construct a 0.98 confidence interval for the mean pulse rate. give
Research question: Are mean crash damages same for these 3 vehicles? Crash1 Crash Damage ($).
how would you find the probability that one of several mutually exclusive events
a survey was conducted at a local high school to determine the number of hours that a student studied for the final
question a water glass is shaped like a cylinder with height 6in. and diameter 2in. how many times as much water can a
Clearly identify the independent and dependent variables you would study. Determine whether a one-tail or two-tail test is most appropriate and explain why. Generate a testable null statistical hypothesis and an alternative statistical hypothesis.
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