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 cases (with a disease or outcome) and controls (without). Experimental studies involve an intervention. Since this is following a group over time without an intervention (they already have the prosthetic), it is a cohort study.
• Second Question: An experimental study design involves an intervention (the lifestyle intervention here). Ecological studies look at group - level data. Cohort studies follow groups over time without an intervention (or with an exposure that is not a manipulated intervention). Case - control studies are retrospective. Here, an intervention is assigned, so it is an experimental study (but since the options don't have experimental for the second question, there may be an error. However, if we assume the closest fit among the given options, cohort is for non - experimental follow - up. But if we consider the nature of the study (assignment to an intervention - even though the options are limited), but if we follow the strict definitions:
• For the second question, if we assume it's a non - randomized assignment (but still an intervention), but among the given options (ecological is group - level, cohort is non - intervention follow - up, case - control is retrospective), there is a problem. But if we consider the first part (assignment to intervention), but since the options are limited, perhaps there is a misprint. But if we go by the first question's logic (for the first question, cohort is correct as it's following a group over time with an exposure (having the prosthetic) and looking for an outcome). For the second question, if we assume it's a non - experimental (but it's not, as there is an intervention). But if we have to choose from the given options (assuming no experimental option in the second question's options shown fully), there is an issue. But if we follow the first question's rule (for the first question, cohort is correct as it's a group followed over time for an outcome with an exposure (prosthetic). For the second question, if we assume it's a cohort (but it's not, as there is an intervention). But if we consider that in some cases, a cohort can have an exposure (the intervention here is like an exposure), but typically, cohort is observational. However, given the options:

Answer:

1. 2) Cohort
2. 2) Cohort (Note: There may be an error in the second question's options as it seems more like an experimental study if an intervention is assigned, but with the given options, cohort is the closest fit if we assume it's a follow - up of a group with an 'exposure' (the intervention assignment) over time)