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Research methods and techniques

Research methods and techniques

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Question 13

An environmental protection agency conducts a hypothesis test to determine if the mean level of a harmful chemical, μ\muμ, in a local lake exceeds the safe limit of 12 mg/L.

The hypotheses are:

H0:μ≤12 H_0: \mu \le 12 H0​:μ≤12 H1:μ>12 H_1: \mu > 12 H1​:μ>12

Based on a sample, the agency does not find sufficient evidence to reject H0 H_0\,H0​ and declares the lake safe. However, the true mean concentration of the chemical is actually 14.5 mg/L. Which of the following correctly describes the error made by the agency?

A

A Type I error, because they rejected H0H_0H0​ when it was actually true.

B

A Type I error, because they failed to reject H0H_0H0​ when it was actually false.

C

A Type II error, because they rejected H0H_0H0​ when it was actually true.

D

A Type II error, because they failed to reject H0H_0H0​ when it was actually false.

Markscheme

Research methods and techniques Questions

  1. A Level
  2. /Psychology
  3. /Research methods and techniques

644 exam-style questions on OCR A Level Psychology Research methods and techniques. Each one has a worked solution and a mark scheme showing where the marks go.

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