State meaning of Type I error

A question is this type if and only if it asks to explain or state what a Type I error means in the specific context of the problem.

2 questions · Moderate -0.8

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CAIE S2 2010 June Q4
6 marks Moderate -0.5
4 At a power plant, the number of breakdowns per year has a Poisson distribution. In the past the mean number of breakdowns per year has been 4.8. Following some repairs, the management carry out a hypothesis test at the 5\% significance level to determine whether this mean has decreased. If there is at most 1 breakdown in the following year, they will conclude that the mean has decreased.
  1. State what is meant by a Type I error in this context.
  2. Find the probability of a Type I error.
  3. Find the probability of a Type II error if the mean is now 0.9 breakdowns per year.
AQA Further Paper 3 Statistics 2022 June Q7
9 marks Easy -1.2
7
  1. Test the scientist's claim, using the 10\% level of significance.
    7
  2. For the context of the test carried out in part (a), state the meaning of a Type I error. [1 mark]