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The status of the axillary lymph node basin is the most powerful predictor of long-term survival in patients with breast cancer. The pathologic analysis of the axillary nodes also provides essential information used to determine the administration of adjuvant therapies. Until recently, an axillary lymph node dissection (ALND) was the standard surgical procedure to identify nodal metastases. However, ALND is associated with numerous side effects, including arm numbness and pain, infection, and lymphedema.
A new procedure, sentinal lymp node (SLN) biopsy, has been proposed as a substitute and it has been reported to have a successful identification rate of about 90%. Suppose that we want to conduct a study to estimate and confirm this rate to identify nodal metastases among breast cancer patients because previous estimates were all based on rather small samples. How many patients are needed to confirm this 90% success rate with a margin of error of G5%? Does the answer change if we do not trust the 90% figure and calculate a conservative sample size estimate?
Find the 90% confidence interval for the mean, variance, and standard deviation for the price in dollars of an adult single-day ski lift ticket.
in a recent year the federal communications commission reported that the mean wait for repairs for verizon customers
How many citizens would need to be sampled if a 99% confidence interval was desired to estimate the true proportion to within 1%?
in an october 2012 survey of 7786 randomly selected adults living in germany 5840 said they exercised for at least 30
If represents the true average gas mileage for this new model, which of the following gives the null and alternative hypothesis that the CONSUMER group should test?
sociologists say that 80 of married women claim that their husbands mother is the biggest bone of contention in their
For a binomial probability experiment, if p is 0.1 and n is only 150, we cannot use the normal approximation to the binomial distribution without continuity correction.
the verbal part of the graduate record exam has a mean ? of 500 and a standard deviation ? of 100. use the normal
The waiting times have a standard deviation of 5.7 minutes. Use a 0.025 significance level to test the claim that with a single line, waiting times vary less than with individual lines.
in simple linear regression through the origin no intercept does the line yhat bx necessarily pass through the point
Determine probability that student was sophomore? Determine the probability of selecting a face card from deck of 52 cards.
an avalanche is a major danger facing skiers snowboarders and snowmobilers. the number of avalanche fatalities per year
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