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A phase III double-blind randomized trial is planned to compare a new drug versus placebo as adjuvant therapy for the treatment of women with metastatic ovarian cancer who have had complete clinical response to their primary treatment protocol, consisting of surgical debulking and platium-based chemotherapy. Find the total sample size needed using a two-sided test at the 0.05 level of significance and a statistical power of 80% to detect the alternative hypothesis that the two-year relapse rates in the placebo and the new drug arms are 60% and 40%, respectively.
Twenty-five percent of the employees of a large company are minorities. A random sample of 7 employees is selected. What is the probability that the sample contains exactly 4 minorities?
With a placebo later developed the disease. Test the claim that the vaccine is effective in lowering the incidence of the disease. Use a significance level of 0.01.
You need to estimate the mean Christmas sales across a large chain of jewelry stores. You want to estimate this mean value to within $100 with 99% confidence
Find out the marginal probability density function for the provided value. Assume that two random variables, X and Y, have bivariate pdf given by:
The standard deviation of the sample is 5. find the best point estimate of the mean. find the 95% condidence interval of the mean score for all golfers.
Construct a 95% confidence interval estimate for the proportion of all workers who did not use the Internet within limits. Explain your findings so that your non-quantitative partner will understand them.
the irs will do a random sampling of tax returns filed in 2010. they are concerned about major fraud and have a new
what is the value of y when x 3 if the equation of the regression line is y 23.1 - 3.8x
From the test data, can we determine whether the oven has an effect on the cake's density? The null hypothesis should be: Oven has no effect on density.
Carry out a significance test for the hypothesis that the two tests have the same population mean. Give the P-value and state your conclusions.
A random sample of 300 beer drinkers is selected and each member of the sample is asked to choose between two brands of beers: Brand A and Brand B. The results are that 165 prefer Brand A and 135 prefer Brand B.
the damon family owns a large grape vineyard in western new york along lake erie. the grapevines must be sprayed at the
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