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Joseph Lister (for whom Listerine is named!) was a British physician who was interested in the role of bacteria in human infections. He suspected that germs were involved in transmitting infection, so he tried using carbolic acid as an operating room disinfectant. In 75 amputations, he used carbolic acid 40 times. Of the 40 amputations using carbolic acid, 34 of the patients lived. Of the 35 amputations without carbolic acid, 19 patients lived. The question of interest is whether carbolic acid is effective in increasing the chances of surviving an amputation.
a) What kind of a study is this?
b) What do you conclude? Support your conclusion by testing an appropriate hypothesis.
c) What reservations do you have about the design of the study?
A survey conducted by the American Automobile Association showed that the family of four spends an average of $215.60 per day while on vacation. Suppose a sample of 64 families of four vacationing at Niagara Falls results in a sample mean of $252...
Do you think n = 30 would be large enough for the approximate normal shape to hold? What is different about these two examples?
In what ways are experimental research designs preferable to correlational or descriptive designs? What are the limitations of experimental designs?
What is the probability that Player I (given his information) describes to the event A?- What is the probability that Player II describes to the event A?
A normal distribution with a mean of 68 years and a standard deviation of 3.5 years. What proportion of the plan recipients would receive payments beyond age 75?
Federated South Insurance Company has developed a new screening program for selecting new sales agents. Given the expected improvement, what is the probability that 19 or more reach their minimum sales goals
a medical inspector wants to estimate the overall average monthly occupancy rates of the cancer wards in 80 different
Discuss the ability of the process to meet the customer's specifications. Also, if the customer seeks Six Sigma compliance, what are your recommendations?
Write a summary that includes only the ones that you have encountered previously and that you believe are effective in describing the data.
1. Can you think of some different alternatives that the ODA might consider for control ling the gypsy moths? 2. Describe a decision that you have had to make recently that was difficult. What were the major issues? What were your alternatives? Did..
What is the mean and standard deviation of the sampling distribution when we take all samples of size25?
If I had 6600 wigets, how many do I have to test with 0 failures to show 95% of them are acceptable with a 95% confidence?
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