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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?
In a group lineup of 7 models in a commercial, 3 are male and 4 are female. In how many ways can you arrange 3 models in a lineup if the first and the third must be a male but the second one must be a female?
Is there evidence of difference in median performance between two methods? (Use α = 0.05.)
AU Cellular believes their sales are more consistent than their rival Softbank Cellular. Below is the number lost calls a day over the last seven days. Do you agree with AU? Use the .01 significance level.
What is meant by the probability of an event? Discuss how addition and multiplication techniques are used to solve probability problems.
Machine which fills quart milk cartons is set up to average 32.2 oz per carton, with standard deviation of 1.2 oz. Determine probability that filled carton will contain less than 32 oz of milk?
During the gestation period of 28 weeks, what percent of the babies born within each gestation period have a low birth weight (under 5.5 lbs)?
given the following information the sampled population is normally distributed n 81 sample mean 38.7 and the
What probability distribution does n1 alone have? Specify the values of the sample size index and parameter for that distribution.
An auditor for Health Maintenance Services of Georgia reports 40% of policyholders 55 years or older submit a claim during the year. Fifteen policyholders are randomly selected for company records.
You own a stock called Insurate, Inc. Your profit for the stock is a random variable (W) with mean 1,000 and variance 400. You would like to buy more stock and you are trying to decide between Insurate
Twenty five young people were sampled in a survey to be used in determining the average expenditures (in dollars) for an evening of dining out.Create a cumulative relative frequency Ogive chart.
a fair coin is tossed 25 times. calculate the chance of getting 17 heads and 8 tails.a. first use the normal
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