A large sample of 10,000 marathon runners was given glucosamine supplements to see if it reduced joint pain. Significance was found at the p < 0.00001 level, but the resulting effect size was very small. As a result, the glucosamine supplement is most likely:
a. Pretty good. They could be on to something.
b. Amazing! Everyone should buy glucosamine supplements!
c. So-so. Might work, might not.
d. Unlikely to have an effect large enough to be of practical significance.
d. Unlikely to have an effect large enough to be of practical significance.
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A study of Romanian children who had been abandoned at birth and placed in state-run institutions but then later placed in foster homes found that:
A. these children had lower intellectual functioning than children who remained in the institutions B. the foster home's socioeconomic status had a significant effect on later IQ scores C. these children had higher intellectual functioning than children who remained in the institutions D. placement in foster homes had no impact on intelligence
If a distribution of numerical scores contains one or two extremely high values, compared to the rest of the scores, which measure of central tendency would produce the most representative value?
a. the mean b. the median c. the mode d. the standard deviation
A gene whose influence will be expressed only when it is paired with a second gene of the same type is known as a __________ gene
a. recessive b. dominant c. polygenic d. gender-linked
When an experiment design has two factors and both factors are tested using related samples, we should perform a
a. two-way within-subjects ANOVA. c. two-way mixed-design ANOVA. b. two-way between-subjects ANOVA. d. two-way dependent-factors ANOVA.