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8. John Lister (for whom Listerine is named) was a British physician who was pioneer in reducing deaths of surgical patients from infections. He suspected that bacteria 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. He did not use carbolic acid during the other 35 amputations. With the exception of the use of carbolic acid for 40 amputations, all other conditions in the operating room were the same for all 75 amputations.a. Explain why this study is an experiment. b. What else would need to be done to make this a randomized experiment? Explain how randomization could be accomplished.c. What is the null hypothesis that Dr. Lister should have tested? What alternative hypothesis should he have considered?d. Assume that randomization was carried out as you described in part (b) and 40 patients were randomly assigned to have their amputation done using carbolic acid as a disinfectant and the other 35 had their amputation done with no disinfectant. Dr. Lister recorded that of the 40 amputations performed using carbolic acid, 34 patients lived. Of the 35 amputations done without using carbolic acid, 19 patients lived. What conclusion could Dr. Lister make from these results? Perform the appropriate hypothesis test, check if appropriate conditions are met, report a value of the test statistic, report a p-value, and state your conclusion. Use a .05 level of significance. Is a cause and effect conclusion justified?
Psychomotor retardation scores for a large group of manic-depressive patients were approximately normal, with a mean of 930 and a standard deviation of 130. What fraction of the patients scored: a) between 800 and 1,100? b) less than 800? ..
Use the approximate method
Determine the best degree program in terms of projected income, using the following decision criteria Maximax - Maximin and Using expected value determine the best degree program in terms of projected income.
A company's stock price rose 362.7% in 2004, but dropped 78.0 in 2005. a. Compute the geometric mean rate of return for the two year period 2004-2005. (Hint: Denote a decrease of 78.0% by -0.78) b. If someone purchased $1,000 of the company's stock..
A typical incoming telephone call to your catalog sales force results in a mean order of $ 28.63 with a standard deviation of $ 13.91. You may assume that orders are received independently of one another.
1. provide a clear statement of the research topic and the underlying relationship that you are modeling. identify the
What would the optimal action be for International before running the sneak preview?
1. first carefully check for any typing mistakes in the data.for example i noticed the birth year for some students as
On any given flight, an airline's goal is to fill the plane as much as possible without overbooking. If, on average, 10% of customers cancel their tickets, all independently of each other, what is the probability that a particular flight will be o..
Analysis of Variance SPSS instructions: Use the five steps of hypothesis testing to determine whether the observed differences in the number of activities in the following table performed by the three groups are statistically significant at the .05 l..
A study was done to test the claim that discharging a newborn infant discharged early (less than 30 hours after birth) is related to re-hospitalization of that infant within a week of discharge.
A random sample of 900 homeowners in Delaware County is taken in order to estimate the average amount of money spent by homeowners on landscaping this spring. It turns out that this group spent an average of $200 with a standard deviation of $..
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