Exercise 2: Why a Single-School Sample Is a Genuinely Different Limitation Than Asch's Sample Size — Possible Solution
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Asch's real conformity study involved a comparatively small sample of
roughly 50 participants, but the real limitation this course flagged
for it in Chapter 6 was mainly about a NARROW POPULATION being
studied - young men at one American college in the early 1950s - which
raises a real, fair question about whether the same conformity rate
would hold up across different ages, genders, cultures, or eras. That
limitation is about GENERALIZABILITY across different KINDS of people,
and it's a limitation Asch's real finding has, in fact, mostly
survived across later replications.

The marshmallow test's real limitation runs deeper than sample size or
even population narrowness alone - it's about a specific, real
CONFOUND lurking inside that narrow sample. Because Mischel's original
50 children were drawn from one relatively advantaged Stanford
nursery school, family background and socioeconomic stability had very
little real variation within that specific sample - most of the
children came from broadly similar, resourced circumstances. This
matters in a way pure smallness doesn't: it means the original study
had no real way to separate "willpower predicts success" from "stable,
resourced family background predicts both waiting longer AND later
success," because within that narrow sample, family background barely
varied at all.

So the real difference is this: Asch's limitation is chiefly about
whether a real finding GENERALIZES to other populations. The
marshmallow test's limitation is about a real, specific alternative
explanation (family background) that the original sample's own lack
of diversity made structurally impossible to rule out - a deeper
methodological problem than sample size or population narrowness on
their own.

ANSWER: Asch's small sample is mainly a generalizability concern -
whether the same conformity rate holds across different populations,
a limitation his finding has largely survived. The marshmallow test's
single-school sample is a deeper problem: because family background
barely varied within that narrow, advantaged group, the original study
had no real way to separate willpower from family circumstances as the
true cause of later success - a specific confound the sample's own
narrowness made impossible to detect, not just a generalizability gap.

WHY THIS WORKS AS AN ANSWER
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This distinguishes a generalizability limitation (does the finding hold
across populations) from a confound-detection limitation (could the
original sample even reveal an alternative explanation), correctly
identifying the marshmallow test's problem as the deeper of the two.