Earlier this week you investigated measures of brain size and intelligence in a sample of 20 youths. A potential shortcoming of your prior analyses is that you did not take into account all available information in the dataset, in particular, gender.
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Answer the following questions and explain your answers:
- Do any of the physiologic variables CCSA, HC, TOTSA, TOTVOL, and WEIGHT differ significantly between males and females?
- Do IQs differ significantly by gender?
- Undertake a paired analysis of IQs, in order to assess whether firstborns have higher IQs than non-firstborns. In this regard, there are 10 pairs of related youths, as denoted by the variable PAIR.