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Patients in "poor" or "good" condition. Refer to the previous exercise. Not all surgery cases are equally serious, however. Patients are classified as being in either "poor" or "good" condition before surgery. Here are the data broken down by patient condition. The entries in the original two-way table are just the sums of the "poor" and "good" entries in this pair of tables.
(a) Find the death rate for Hospital A patients who were classified as "poor" before surgery. Do the same for Hospital B. In which hospital do "poor" patients fare better?
(b) Repeat (a) for patients classified as "good" before surgery.
(c) What is your recommendation to someone facing surgery and choosing between these two hospitals?
(d) How can Hospital A do better in both groups, yet do worse overall? Look at the data and carefully explain how this can happen.
1. IA Credit Card Company wants to evaluate the usage of their card. They randomly selected 16 credit card holders and found that the mean amount they charged in the past twelve months was $2017, while the standard deviation was $867.
They have asked for an analysis of the stock out probabilities for various order quantities, an estimate of the profit potential and to help make an order quantity recommendation.
The mean arrival rate is 15 cars per hour. What is the probability that 20 or more cars will arrive during any given hour of operation?
a beer distributer believes that the amount of beer in a 12 ounce can of beer has a normal distribution with a mean of
20% of teenagers in a small town say they like reading news online. Suppose you randomly select 7 teenagers from the town and ask them whether or not they enjoy reading news online. Find the probability that at least 3 say they enjoy reading news ..
1. suppose a realtor is interested in comparing the asking prices of homes in philadelphia and baltimore. a random
The following data are the result of a historical study of the number of flaws found in a porcelain cup produced by a manufacturing firm.
Make a 99% confidence interval for the mean construction cost for all vacation homes built in this region during the past 2 years.
How many of those meals should he plan on serving in order to be pretty sure of having enough steaks on hand to meet customer demand? Justify your answer.
As part of the National Health and Nutrition Examination Survey, the Department of Health and Human Services obtained self-reported heights and measured heights for males aged 12-16. All measurement is in inches. Listed below are sample results.
The person's body fat percentage, and ‘y' is the person's lean mass percentage. Predict the lean mass for a person who is 27 years old and has a body fat percentage of 4.5%.
Discuss how the statistical application of Pearson r is used for hypothesis testing. Through application of the Spearman Correlation discuss what type of data the Pearson formula can be used for.
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