Some form of prophylaxis is said to be 90% effective at prevention during one year's treatment. If the degrees of effectiveness in different years are independent, show that the treatment is more likely than not to fail within 7 years
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Some form of prophylaxis is said to be 90% effective at prevention during one year's treatment. If the degrees of effectiveness in different years are independent, show that the treatment is more likely than not to fail within 7 years
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- A clinician interested in agoraphobia (fear of public places) tests a new treatment method. She samples five agoraphobics from her clinic and has them report how many times they ventured out of their houses (on their own) in the past month. They then received relaxation training and were introduced to trips away from their homes at gradually increasing durations. After 2 months, subjects again reported how many times they ventured (on their own) out of their houses. The data are below. Assess whether there is a significant change in trips outside the home from before to after therapy. a. What are the null and alternative hypotheses? b. What inferential test did you use? Using an alpha level of .05, determine whether the sample was significantly different from population.A clinician interested in agoraphobia (fear of public places) tests a new treatment method. She samples five agoraphobics from her clinic and has them report how many times they ventured out of their houses (on their own) in the past month. They then received relaxation training and were introduced to trips away from their homes at gradually increasing durations. After 2 months, subjects again reported how many times they ventured (on their own) out of their houses. The data are below. Assess whether there is a significant change in trips outside the home from before to after therapy. a. Report and interpret an effect size b. what type of error might you be making?A total of 150 participants are selected for a study of risk factors for cardiovascular disease. At baseline (study start), 24 are classified as hypertensive. At one year, an additional 12 have developed hypertension and at 2 years another 8 have developed hypertension. What is the prevalence of hypertension at 2 years in the study?
- Two types of medical devices used for knee replacement are being studied to see if the type of knee replacement used affects the rate of infection for a specific bacterial infection. The infection rate for a specific bacterial infection after surgery for device A is 0.0043. The rate for the same bacterial infection is 0.0121 for device B. How does the risk of developing the bacterial infection in individuals using device B compare to the risk of developing the bacterial infection in individuals using device A? Individuals using device A are 2.814 times more likely to develop the bacterial infection of interest than individuals using device B. Individuals using device B are 2.814 times more likely to develop the bacterial infection of interest than individuals using device A. Individuals using device A are 1.35 times more likely to develop the bacterial infection of interest than individuals using device B. Individual using device B are 1.35 times…a pathological video game user(PVGU) is à video game user averages 31 or more hours a week of of gameplay.without treatment, 20 out of 100 clients with depression will improve. After developing a new treatment for depression, you test it on 250 clients with depression and find that 75 show improvement. so the data support the idea that your treatment works?
- Early life corresponds to the first bacterial colonization of the digestive tract, creating a microbiome thought to play an important role in human development. What might be the effect of early exposure to antibiotics on children's development? One study followed 11,532 full-term babies all born in the county of Avon, United Kingdom, during 1991 and 1992. Exposures to antibiotics during infancy were recorded, along with measures of body mass at regular intervals over several years. The researchers found that antibiotic exposure during the first six months of life was associated with increased body mass later in childhood.A study is conducted to test a new drug claimed to reduce diastolic blood pressure in adults with a history of coronary heart disease. What is the most efficient study to test whether the drug reduces diastolic blood pressure?Age and obesity are the two strongest risk factors for treatment resistant hypertension (TRH), prompting many doctors to predict that as our population ages and gets heavier, the incidence of this unhealthy condition will increase. Suppose you have a new drug that you think will reduce TRH. Seven patients who have been diagnosed with high blood pressure volunteer for your study. They have their diastolic pressure measured before they take the drug, and after the drug has been administered and has had time to have an effect. The table below shows the result of your study. Does your new drug reduce blood pressure? Use alpha =.05. Identify the Independent variable and the dependent variable in the study. State the Null hypothesis and the alternative hypotheses. Using APA format, report your findings using the variables in the study. Patient Before Drug After Drug 1…
- A headline at MSNBC.com stated “One way to ward off Alzheimer’s: Take a hike. Study: Walking at least one mile a day reduces risk of cognitive impairment by half.” The article reports on a study showing that elderly people who walked a lot tended to have more brain mass after nine years and were less likely to develop dementia that can lead to Alzheimer’s disease than subjects who walked less. At the start of the study the researchers measured the walking habits of the elderly subjects and then followed up with measures of brain volume nine years later. Assuming that active walkers really did have more brain mass and fewer dementia symptoms, is the headline justified? Answer this question thoroughly using some of the terminology and vocabulary that we learned while study Chapter 1 of our textbook. (You might think about terms such as random sampling, random assignment, observational study, experiment, cause and effect, and confounding variable. Some of those words will be useful to…The deadly Ebola virus is a threat to both people and gorillas in Central Africa. An outbreak in 2002 and 2003 killed 91 of the 95 gorillas in seven home ranges in the Congo. To study the spread of the virus, measure "distance" by the number of home ranges separating a group of gorillas from the first group infected. Here are data on distance and time in number of days until deaths began in each later group. (Data set may be found here.) Distance 1 3 4 4 4 5 Time 4 21 33 41 43 46 (a) Make a scatterplot. Which is the explanatory variable? What kind of pattern does your plot show?(b) Find the correlation r between distance and time.