**Study A found that participants who slept 8 hours scored 12% better on memory tests than those who slept 4 hours. Study B found the same with a separate sample but only a 3% improvement. Study C, with the most participants, showed an 18% improvement.** Which statement is BEST supported by the three studies together?
AMemory improves only after 18% sleep
BSleep duration appears to influence memory performance, though the SIZE of the effect varies across studies
CStudies show no relationship between sleep and memory
DSleep deprivation does not affect memory
Answer & Solution
Correct answer: B. Sleep duration appears to influence memory performance, though the SIZE of the effect varies across studies
All three studies show improved memory with more sleep, supporting a real effect. But the effect sizes vary (12%, 3%, 18%), suggesting the magnitude isn't precisely fixed — perhaps depending on participant characteristics or methodology. Option B captures this carefully. Option A contradicts; C nonsensical; D contradicts.
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