A cognitive psychologist is investigating whether a new mnemonic technique improves recall scores. To be extremely cautious about falsely claiming a positive effect, they decide to use a significance level of p≤0.01 p \le 0.01\,p≤0.01 instead of the standard p≤0.05p \le 0.05p≤0.05.
What is the effect of choosing this more stringent significance level on the probability of committing Type I and Type II errors?
The probability of making a Type I error increases, while the probability of making a Type II error decreases.
The probability of making a Type I error decreases, while the probability of making a Type II error increases.
The probability of making both a Type I error and a Type II error increases.
The probability of making both a Type I error and a Type II error decreases.
513 exam-style questions on OCR A Level Psychology Data recording, analysis and presentation. Each one has a worked solution and a mark scheme showing where the marks go.