Hi !
Answer:
<em>A measure of intelligence based on head size is likely to have a "high" level of reliability and a "low" level of validity.</em>
Cereal companies are blamed for putting too much sugar into their products, which causes obesity. This is bad for them, as it would stop people from bying their products. So they would have an interest in study showing that this is not the case: the study would be a self-interest study (the correct answer) and therefore not be reliable
