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Medicine and Clinical Studies The number of Emergency Room visits has increased over the past several years in the United States. One reason for this increase may be that in difficult economic times people tend to postpone routine health care. This results in more visits to the ER. Of all patients who visit an Emergency Room, suppose 22% are seen in less than 15 minutes, 13% are admitted to the hospital, and 5% are seen in less than 15 minutes and admitted to the hospital.11 Suppose a patient who made an Emergency Room visit is selected at random.
a. Carefully sketch a Venn diagram showing the relationship between the events seen in less than 15 minutes and admitted to the hospital, and add probabilities to the appropriate regions.
b. What is the probability that the patient was seen in less than 15 minutes or admitted to the hospital?
c. What is the probability that the patient was seen in less than 15 minutes but not admitted to the hospital?
d. What is the probability that the patient was neither seen in less than 15 minutes nor admitted to the hospital?
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The daily returns on a portfolio are normally distributed with a mean of 0.001 and a standard deviation of 0.002. What is the probability that the average return for the portfolio over the next 100 days exceeds 0.0015?
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1) We test the null hypothesis H0: μ = 10 and the alternative Ha: μ ≠ 10 for a normal population with σ = 4. A random sample of 16 observations is drawn from the population and we find the sample mean of these observations is x = 12. The P-value is c..
If he knows that the measurements follow a normal distribution and the standard deviation for this procedure is 1.2 degrees, what is the confidence interval for the population mean at a 95% confidence level?
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a student took two national aptitude tests. the national average and standard deviation were 675 and 150 respectively
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