1) Researchers in South Africa were interested in prevalence of
HIV-related behaviors and infection in the population. They
administered a survey of 500 men and women who came for health care
at a hospital clinic in Johannesburg. At the same time, all
subjects were tested for HIV status. Prevalence of HIV was higher
in men than in women. Men were also more likely to use IV drugs and
to engage in sex with multiple sex partners. What type of study...
3. Provide 5 examples of research studies with cross-sectional
study design. What were the independent and dependent variables in
each of these studies? Add references for each example.
4. Provide 5 examples of randomized controlled trials (RCTs).
What were the independent and dependent variables in each of these
studies? Add references for each example.
Chronic insomnia
10 people with chronic insomnia received a study in 4 studies that were intended to increase the number of hours of sleep. One of these treatments was placebo.
1- Calculate the average number of hours of sleep for each of the 4 treatments. Also enter a 95% confidence interval for the average.
2- Create box plot for each of the 4 treatments in the same graph. How will you describe the distribution of treatments?
3- Calculate how...