A test has recently been developed for Swine flu (H1N1 virus) that can be given to travellers returning to the US from other countries. Like all medical tests, this test is notperfect. During one of the initial trials of the test, 1000 individuals from Mexico were tested. Of those tested, 10 had swine flu but tested negative (false negative), 60 hadswine flu and tested positive, and 30 did not have swine flu but tested positive. The remaining 900 individuals did not have swine flu and tested negative.Write out the following probabilities and put your answer into the simpliest possible fraction:I. P(+ test|Flu)=[a]II. P(- test|Flu)=[b]III. P(+ test| no Flu)=[c]IV. P(- test|no Flu)=[d]If a tourist returning to the US from Mexico tests positive for swine flu, what is the probability that s/he actually has the virus?(put your answer into the simpliest fraction)[e]

Total 1000 People had Swine Flu and tested Negative 10 People had Swine Flu and tested Positive…

Answered: A test has recently been developed for…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A new medical test is designed to quickly detect whether someone is infected by SARS or not. The test result could be either positive or negative. A group of1250 persons have gone through the test among which 1175 are free of SARS infection. Among the 1175 healthy people, 1170 of them return negative test results; while among the remaining infected people, 73 of them return positive test results.Based on the above information, if positive test result is returned for another person, is he/she infected by SARS or not?
For several decades, it was a common practice in Southern California for houses to be built with pools in the backyard (as any airplane flight which ends at a Southern California airport will reveal). Now, however, that practice may be changing, possibly because of the recent demand for landscaped homes, which experts believe help reduce pollution. A recent study examined a random sample of 140 houses built in Southern California between 1950 and 1985 and an independent, random sample of 87 houses built in Southern California from 1992 to the present. The sample of houses built in 1950 - 1985 contained 52 houses with pools, and the sample of houses built from 1992 - present contained 29 houses with pools. Based on this survey, can we conclude, at the 0.01 level of significance, that the proportion p, of all Southern California houses built in 1950 - 1985 that were built with pools is greater than the proportion p, of all Southern California houses built from 1992 - present that were…
For several decades, it was a common practice in Southern California for houses to be built with pools in the backyard (as any airplane flight which ends at a Southern California airport will reveal). Now, however, that practice may be changing, possibly because of the recent demand for landscaped homes, which experts believe help reduce pollution. A recent study examined a random sample of 126 houses built in Southern California between 1950 and 1985 and an independent, random sample of 80 houses built in Southern California from 1992 to the present. The sample of houses built in 1950-1985 contained 62 houses with pools, and the sample of houses built from 1992-present contained 27 houses with pools. Based on this survey, can we conclude, at the 0.05 level of significance, that the proportion p1 of all Southern California houses built in 1950-1985 that were built with pools is greater than the proportion p2 of all Southern California houses built from…
If a male receives a positive pregnancy test, is this type I or type II error?
just the last part thank you!
The state of Georgia's HOPE scholarship program guarantees fully paid tuition to Georgia public universities for Georgia high school seniors who have a B average in academic requirements as long as they maintain a B average in college. It was reported that 73 out of the 137 randomly selected students entering Ivan Allen College at Georgia Tech (social science and humanities) with a HOPE scholarship lost the scholarship at the end of the first year because they had a GPA of less than 3.0. It was also reported that 72 of a random sample of 111 students enterin the College of Computing with a B average had lost their HOPE scholarship by the end of the first year. Is there convincing evidence that the proportion who lose HOPE scholarships is different for the College of Computing than for the Ivan Allen College? (Use the 4-step process) State: Plan: Do: Conclude: b)Given your conclusion above, which type of error, Type I or Type II, is it possible to make? Describe that error in the…
Electric vehicles are often categorized by the range of miles that can be travelled on a single battery charge, since charging stations are not yet widespread in the United States. The latest model of a certain brand of electric car is reported to have an average range of 240 miles. An auto industry journalist would like to verify this claim, since he believes that the true range of the car may be less than 240 miles. The journalist selected and tested a random sample of 120 cars of this model and found that the average range of the sample was 229.8 miles with a standard deviation of 47.7 miles. Apply the p-value method to test the hypothesis that the average range of this electric car model is less than 240 miles, using a significance level of 5%. State the null and alternative hypothesis for this test. Ho: ? V H₁: ? V Determine if this test is left-tailed, right-tailed, or two-tailed. Otwo-tailed Oleft-tailed Oright-tailed Should the standard normal (2) distribution or Student's (t)…
An anger-management course claims that, after completing its seminar, participants will lose their tempers less often. Always a skeptic, you decide to test this claim. A random sample of 12 seminar participants is chosen, and these participants are asked to record the number of times that they lost their tempers in the two weeks prior to the course. After the course is over, the same participants are asked to record the number of times that they lost their tempers in the next two weeks. The following table lists the results of the survey. Using these data, test the claim at the 0.10 level of significance assuming that the population distribution of the paired differences is approximately normal. Let participants before completing the anger-management course be Population 1 and let participants after completing the anger- management course be Population 2. Number of Times Temper Was Lost during a Two-Week Period 10 11 6 3 4 59 12 12 11 4 8 12 6 4 5 4 4 11 13 12 5 Before After Copy Data…
A new drug to treat psoriasis has been developed and is in clinical testing. Assume that those individuals given the drug are examined before receiving the treatment and then again after receiving the treatment to determine if there was a change in their symptom status. If the initial results showed that 3.0% of individuals entered the study in remission, 74.0% of individuals entered the study with mild symptoms, 13.0% of individuals entered the study with moderate symptoms, and 4.0% entered the study with severe symptoms calculate and interpret a chi-squared test to determine if the drug was effective treating psoriasis given the information below from the final examination. Remission (No Symptoms of Psoriasis) Mild Symptoms of Psoriasis Moderate Symptoms of Psoriasis Severe Symptoms of Psoriasis Total Number of Participants to Receive the Drug Number of Participants 455 635 85 7 1182
People who work out vigorously for an hour or more experience loss of electrolytes such as calcium, potassium, and sodium that are released from the body by sweat. Potassium is a very important part of many bodily functions for athletes, including transmitting nerve signals and fluid balance. A random sample of 9 athletes were given water after a vigorous one-hour workout and their electrolytes were then checked and recorded. After another vigorous one-hour workout on a different day, the same 9 athletes’ electrolytes were checked after being given a sports drink. Their potassium levels are given below. Do sports drinks help replenish lost potassium levels more than water after a vigorous workout? Refer to the table below. Water: 4.17, 2.88, 4.71, 4.79, 5.11, 4.12, 3.95, 4.22, 3.86 Sports Drink: 4.20, 3.30, 4.69, 4.82, 5.17, 4.08, 4.49, 4.54,3.71 hypothesis test needed Hypothesis test needed
Mammography and clinical breast examination are the two major techniques used to screen for breast cancer. However, as true for any screening test, they are not completely accurate. If it is determined, based on mammographic findings, that there is a possibility of breast cancer, this is usually confirmed or disconfirmed by a subsequent biopsy. A false positive test is a mammogram positive test that is disconfirmed by biopsy. The data in Table 1 were reported in a paper concerning breast cancer screening (Elmore, et al, New England Journal of Medicine 1998; 338(16): 1089-1096). Table 1 False positive breast cancer screening tests over a 10-year period # Screening tests # False positive tests 9762 631 1. Another aspect of mammographic screening is the presence of false negatives. A false negative is a screen negative woman who has breast cancer. False negatives usually occur because the tumors are small and hard to detect. It is estimated that among women with breast cancer, 2% of all…
A homeopathic drug company developed a new drug designed to prevent colds. The company claims there is no difference between the effectiveness for men and women. To test the claim they chose a simple random sample of 100 women and 150 men who participated in the trial.At the end of the study, 56% of the women caught a cold, and 40% of the men caught a cold. Based on these findings we are testing to see if there is a difference in the effectiveness for women and men.a) Define the parameter(s) of interest.b) State the Hypotheses.c) Find the value of the relevant sample statistic using correct notation:_________________________ Based on the randomization distribution below, what is the p-value ____________________

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