A researcher is conducting a study on the effectiveness of a new educational program. They recruit participants by asking for volunteers from a local community center. What is a significant limitation of this sampling method regarding generalisability?
Question 2
Which of the following best describes the concept of a sampling frame?
Question 3
In the context of sampling, what does the term 'target population' refer to?
Question 4
Which type of validity is most directly threatened by a biased sample?
Question 5
A researcher is conducting a study on the effects of sleep deprivation on cognitive performance. They recruit participants by posting flyers in university dorms and selecting the first 30 students who respond. This method is most likely to lead to which type of bias?
