Question

question: you are working with a medical team to determine how long knee joint prothesis will last. people who have received a prosthetic are enrolled in the study and then followed over time to determine the outcome. what type of study is this?

1. cross - sectional
2. cohort
3. case - control
4. experimental

question 4 (6 points)
question: a team of scientists is conducting a study to investigate the impact of a specific lifestyle intervention on weight loss over a 6 - month period. overweight individuals will be assigned to the intervention and then evaluated after 6 months. what study design is this?

1. ecological
2. cohort
3. case - control

Explanation:

• First Question:
• A cohort study follows a group of people (in this case, those with knee - joint prostheses) over time to observe an outcome (how long the prosthesis lasts).
• Cross - sectional studies look at a population at a single point in time. Case - control studies compare those with and without an outcome (retrospectively). Experimental studies involve an intervention (not just observation as in this case).
• Second Question:
• An experimental study involves an intervention (the lifestyle intervention) on a group (overweight individuals) and then measures the outcome (weight loss after 6 months).
• Ecological studies look at group - level data. Cohort studies are observational (no intervention assignment as described here). Case - control studies are retrospective.

Answer:

1. 2) Cohort
2. 4) Experimental