Imagine two of your classmates want to conduct a study involving PSYC20008 students.

Of the 1,100 students who they invite, 700 reply and consent to participate. Of those 700, only 300 students (who are studying their Bachelor of Science) are relevant for their first analysis, and only 100 students (who are studying their Graduate Diploma in Psychology) are relevant for the second analysis.

How many participants are in the study sample?

Question

Imagine two of your classmates want to conduct a study involving PSYC20008 students.

Of the 1,100 students who they invite, 700 reply and consent to participate. Of those 700, only 300 students (who are studying their Bachelor of Science) are relevant for their first analysis, and only 100 students (who are studying their Graduate Diploma in Psychology) are relevant for the second analysis.

How many participants are in the study sample?

BlackTom AI · Accepted Answer

To determine the study sample size, I will walk through what each figure represents in the scenario described.
Option A: 1,100. This is the number initially invited, not the actual sample that agreed to participate. The invitation count is the potential pool, but the sample size is based on consented participants, so this overstates the actual sample.
Option B: 700. This is the number of students who replied and consented to participate. In most study designs, the sample includes those who agreed to take part, so 700 represents the participant pool available for analysis after consent.
Option C: 400. This combines two later figures (300 and 100) that correspond to two separate analyses or subgroups, not the overall sample. It would be incorrect to add them as a single sample size unless the study explicitly treated them as one combined group, which the description does not indicate.
Option D: 300. This corresponds to the subset of consented participants who are relevant for the first analysis (Bachelor of Science). It is the sample size for that specific analysis, not the overall study sample when considering all consenting participants.

Each option reflects a different scope: the initial invitation (A), the consented full sample (B), a combined or subgroup figure (C), and a specific-analyses subgroup (D). The most appropriate interpretation of 'the study sample' given the description is the number of students who consented to participate, which is 700. However, remember that the two analyses use smaller, more specific subgroups (300 for the first analysis and 100 for the second), which are not the overall sample size but subsamples for particular analyses.

PSYC20008_2025_SM1 Exam: Developmental Psychology (PSYC20008_2025_SM1)- Requires Respondus LockDown Browser

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