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The primary objective of a phase III trial is to compare disease-free survival among women with high-risk operable breast cancer following surgical resection of all known disease and randomized to receive as adjuvant therapy either CEF or a new therapy. CEF has been established successfully as a standard adjuvant regimen in Canada; the aim here is to determine whether the addition of a taxane (to form the new regimen) can improve survival outcome over CEF alone. The five-year disease-free survival rate for women receiving CEF alone as adjuvant therapy was estimated at about 60%, and it is hypothesized that the newly formed regimen would improve that rate from 60% to 70%. Find the total sample size needed using a two-sided test at the 0.05 level of significance and a statistical power of 80%.
Consumer Reports published an article on some sport-utility vehicles they had tested recently. They reported some basic information about each of the vehicles and the results of some tests conducted by their staff.
a sample of 25 pieces of laminate used in the manufacture of circuit boards was selected and the amount of warpage in.
in a survey of 2000 adults 50 years and older of whom 80 were retired and 20 were pre-retired the following question
The historical reports from two major networks showed that the mean number of commercials aired during prime time was equal for both networks last year.
A sample of students were asked to rank their looks compared to the looks of others on a scale from 1 to 10. A 10 means they feel they are more attractive than everyone else while a 1 means they feel they are less attractive than everyone else. Th..
Assume that demand for services per period is Pt = 1000 - Qt where Qt is the stock of the durable consumed. Let the discount factor for consumers and the firm be given by δ. Find the profit-maximizing prices and outputs for a durable goods monopol..
In a study of 10 graduate students from a nurse education program, the average age of the group was 48.6 years and the standard deviation was 4.1 years. Assume the variable is normally distributed. Find the 95% confidence interval of the true mean..
the table below gives information on coded length measurements in a machining process. the data shown are macrx and r
The daily revenue totals for the next 30 days will be monitored. What is the probability what the mean daily revenue for the next 30 days will exceed $7500?
Iindicate all samples are approximately Normal with no outliers. Is the ANOVA appropriate?
customer's time is worth $1 per hour and should be accounted for in the model. If customers arrive at a Poisson rate of 10 per hour, then what is the average cost per hour if Mary is hired? if Alice is hired?
What is the di?erence between the binomial and the Poisson distributions and Give some examples of when we can apply the Poisson distribution.
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