- Homework Solutions
- Homework Questions & Answers
The department of health of a certain state estimates a 10% rate of HIV
|at risk||test positive||test negative||total|
b) of those with HIV,postive = 475/500=
0.9500 = 95%
of those with test positive, HIV are = 475/698= 0.6805 or 68.10%
option a) is correct
P(disease|test positive) = P(disease and positive)/P(test positve)= =475/698= 0.6805 or 68.05%
A patient in the at risk category who test postive has a 68.1%
chance of having disease which is greater than the overall at risk
incidence rate of 10%
|gen. population||test positive||test negative||total|
of those with HIV,% of test positive = 53/60*100=
of those test positive,% of having HIV=53/1040*100= 5.1%
option b) is correct
e) P(disease| positive) = P(disease and positive)/P(positive) = 5.1%
the chance of patient having HIV is 5.1% ,compared to overall
incidence rate of 0.3%
The department of health of a certain state estimates a 10% rate of HIV The Department...
1. For the choirmaster. A psalm of David. 2. Hear.my.troubles, O God. Kesp.me.safe from terror, The Department of Health of a certain state estimates a 10% rate of HIV for the general population Tests for HIV are 95% accurate in detecting both true negatives and true positives. Random see 5000 "at risk people and 20,000 people from the general population results in the following table. Use the table below to complete parts (a) through (e). at risk population and a...
Although Western countries typically have low HIV prevalence rates (e.g., about 0.2% of the Australian population has HIV), clinics offering free HIV testing usually attract at-risk groups among whom the prevalence rate is much higher. Managers of such a clinic believe that 12% of their patients have HIV. The clinic uses a diagnostic test which returns a positive result in 98% of cases where the patient actually has HIV. Among patients without HIV, 96% of test results are negative. The...
3) A certain blood test for a disease gives a positive result 90% of the time among patients having the disease. It also gives a positive result 25% of the time among people who do not have the disease. It is believed that 30% of the population has this disease a) What is the probability that a person with a positive test result indeed has the disease? b) What is the probability that the blood test gives a negative result?...
A screening test for a rare form of TB has a 7% false positive rate (i.e. indicates the presence of the disease in people who do not have it). The test has an 8% false negative rate (i.e. indicates the absence of the disease in people who do have it). In a population of which 0.6% have the disease, what is the probability that someone who tests positive has the disease?
A screening test for a rare from of TB has a 7% false positive rate (i.e. indicates the presence of the disease in people who do not have it). The test has an 18% false negative rate (i.e. indicates the absence of the disease in people who do have it). Suppose that 3% of the population have the disease. (i) Partition the sample space into those who have the disease, B1, and those who don’t have the disease, B2. Find...
What was the cumulative incidence of HIV among study participants in January 2003? What was the cumulative incidence of HIV among study participants in January 2003? In January 2000, 5000 men and women aged 18-30 years were recruited from a semi-urban area near Durban (South Africa) and assessed for human immunodeficiency virus (HIV). Participants who did not test positive for HIV, at baseline in 2000, were followed-up and assessed again 3 years later in January 2003 (only those who previously...
Due to the increasing prevalence of HIV/AIDS among adults aged 40–65 years, a local health department is interested in HIV prevention strategies for men and women in this age group. The health department has partnered with local churches, barber shops, and salons to conduct one two-hour group workshop about HIV testing and safer sex practices, specifically condom use. The desired outcomes of the programs are increased condom use, knowledge, HIV incidence, social support, HIV testing, and self-efficacy for condom use...
It is known that 2.6% of the population has a certain disease. A new test is developed to screen for the disease. A study has shown that the test returns a positive result for 18% of all individuals, and returns a positive result for 92% of individuals who do have the disease. If a person tests positively for the disease under this test, what is the probability that they actually have the disease? 0.1276 0.1329 0.1435 0.1223 O 0.1382
A scientist designed a medical test for a certain disease. Among 100 patients who have the disease, the test will show the presence of the disease in 96 cases out of 100, and will fail to show the presence of the disease in the remaining 4 cases out of 100. Among those who do not have the disease, the test will erroneously show the presence of the disease in 3 cases out of 100, and will show there is no...
ltis known that 3% ofthe Uk's population carry a certain disease. Atest forthe disease is available Leave 5 which always gives either a positive or a negative result. Given that the individual carries the disease, there is a 98% chance that the test will give a positive result. Given that the individual does not carry the disease, there is a 95% chance that the test will give a negative result. blank a) i) Joey takes the test and gets a...