The same lab is conducting a longitudinal study with assessments at 6, 18, and 30 months. The study goal is to follow a total of 50 infants over the time period. However, when checking the study log you find that already 60 infants were assessed at age 6 months. The graduate student tells you that more infants were recruited because of:

Question

Quizplus · Accepted Answer

The additional recruitment of infants beyond the planned 50 is most likely due to expected attrition, or the likelihood that some infants will drop out of the study over time. By recruiting more infants at the outset, the study can ensure that a sufficient number of participants are retained at each time point to maintain statistical power and validity. The other options (unbiased sampling and normal distribution) do not seem relevant to this situation.

The Same Lab Is Conducting a Longitudinal Study with Assessments