Is an EPQ meant to be written for a non-specialist audience?

I was under the impression EPQ essays should be written for a non-specialist audience however my teacher is telling me I should write it for experts and has told me to cut out a lot of the explanation of things like the placebo effect and Rosenthal effect for example. To confuse matters further, there is another EPQ class at my school with a different teacher who have been told to write as if the audience know 'less than nothing' about the topic.

What have other people been told??? I'm so confused, not helped by the fact the two teachers' advice constantly contradicts each other....

Wrote it for someone who is reasonably intelligent, knowledgeable and can pick things up easily.
If there is some variation and your teacher wants more specialism, then move to that as they will be the ones marking it.

My teacher is asking me to write with lots of assumed knowledge eg. not explaining the different phases of a clinical trial...which seems a bit counter intuitive to me??

Talk to them again, but ultimately as they are marking it then I would write to their order.

Okay I will do, you're right as I'm writing it for their marking. It just sets off alarm bells when the other group gets advice that directly contradicts ours. But that's a problem specific to my school, thank for your help!