Answer: D. It can be conducted with existing data
Explanation:
Cohort studies observe a number of people over a period of time to discover the factors pertaining to a disease such as its causes and effects. It can be prospective, which uses data gathered in the future or retrospective which uses data already collected.
Prospective cohort studies are useful in estimating risk and impractical for studying rare diseases due to the need for a large group. When used to identify the cause of a disease, a hypothesis is tested by monitoring a cohort for any differences in health associated with the risk factor
.
Existing data. and the study of diseases with a long latency between exposure and symptoms development apply to retrospective cohort study.
Answer: Matrix
Explanation:
Matrix structure is the structure in the form of grid where employee or workers report to one or more leader.Employee tend combine for working across their department along with performing operations in their own department in an organization.
According to the question, matrix structure should be used by defense contractor as he want reporting and link across the department for the project.
The hypothesis for an experiment that finds that teenagers who play video games to have an increase in regards to critical thinking skills are the following;
Hypothesis:
- Teenagers who play video games have increased critical thinking skills
- Video games have provided a useful form in regards of mental exercise
Answer:
prisoners
Explanation:
Prisoners have been popular victims(research subjects) of illegal research in the past and so laws have been put in place to prevent this.
Prisoners are classified as "vulnerable" under federal regulations that regulate research with prisoners. This is because their informed consent and voluntary decision to participate in any research brought before them is somewhat compromised. The health and human services(HHS) in addition to other regulations have added additional requirements for research on prisoners such as the requirement of a prisoner or prisoner representative in the IRB.
