In the context of statistical hypothesis testing:
State what is meant by a Type I error.
A clinical trial for a new therapeutic treatment chooses to use a 1% level of significance instead of the conventional 5% level of significance.
Explain the effect of this decision on the probability of committing: (i) a Type I error, (ii) a Type II error.
121 exam-style questions on AQA A Level Psychology Inferential testing (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.