Randomised control trial pre

What is the primary purpose of randomization in an RCT?

• To ensure that the sample size is large enough

• To eliminate selection bias

• To ensure the study is double-blind

• To allow for easier data collection

Which of the following best describes the concept of blinding in clinical trials?

• The process of randomly assigning participants to different treatment groups

• The method of selecting a representative sample from the population

• The procedure used to keep study participants, healthcare providers, and researchers unaware of which treatment the participants are receiving

• The statistical analysis used to compare outcomes between different treatment groups

In an RCT, what is a placebo?

• An active treatment that is given to the control group

• A substance used to measure the effectiveness of the main treatment

• The main intervention being tested in the study

• An inactive substance or treatment given to the control group

Which of the following is a primary advantage of a randomized controlled trial (RCT)?

• Ability to observe the natural progression of disease

• High external validity and generalizability

• Ability to establish causality between an intervention and an outcome

• Lower cost compared to other study designs

Which of the following is a major disadvantage of randomized controlled trials (RCTs)?

• Ethical concerns and high cost

• Difficulty in controlling for confounding variables

• Inability to establish temporal relationships

• Limited ability to measure multiple outcomes simultaneously

What is the main purpose of using a placebo in an RCT?

• To treat the control group effectively

• To mask the allocation of treatment to prevent bias

• To reduce the sample size needed for the study

• To ensure ethical standards are met