Haiyin Liu
2019/10/5
QDAFI of Ryan, J. J., Bartels, J. M., & Townsend, J. M. (2010). Associations between climate
and IQ in the United States of America. Psychological Reports, 107(1), 251-254.
Q: Is IQ at the national level associated with the nation’s climate? How?
D: The measured data are: the mean year-round temperature of 48 states based on the mean
temperature of two coldest months and two warmest months; the estimated state IQ collected by
McDaniel based on the NAEP. Besides, to control other confounding variables, there are
additional data measured: the percent Hispanic, Black, Asian in state populations from 2000
census, and the pupil/teacher ratio for elementary and secondary schools in states by McDaniel.
A: Using the data to compute the Partial Pearson product-moment correlation between estimated
state IQs and the temperature of the summer/winter and the whole year respectively, and control
other measured data at the same time for the accuracy. If there is a negative relationship, then the
state IQ is negatively associated with the weather.
F: There are negative relationships between both estimated state IQs and the summer/winter
temperature and the IQs and the year-round temperature.
I: They are associated. The lower the temperature, the higher the state IQ. This can be explained
by to adapt the cold weather, humans that migrate from warm weather conduct cognitive tasks,
which cause them to have larger brains.