Question Paper & Mark Scheme (Merged) Friday 13 June 2025 [VERIFIED]
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Answer all questions in the spaces provided.
1 The continuous random variable X has standard deviation 16
Find Var(5X – 12)
Circle your answer.
[1 mark]
80 400 6388 6400
2 The discrete random variable Y has probability distribution
y –6 2 3 18
P(Y = y) 0.56 0.02 0.21 0.21
Find the mode of Y
Circle your answer.
[1 mark]
–6 0.21 0.56 18
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3 Cosmo is carrying out a hypothesis test.
He rejects the null hypothesis.
State which of the following statements is correct.
Tick () one box. [1 mark]
He could have made a Type I error but not a Type II error.
He could have made a Type II error but not a Type I error.
He could have made both a Type I error and a Type II error.
He has made neither a Type I nor a Type II error.
Turn over for the next question
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