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Old 11-02-2011
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Default Analysing for favorable results

A researcher performs her first experiment as a junior professor. Under pressure to generate grant funding, she tinkers extensively with the analysis, looking for the most favorable results. Under which of the following circumstances can the null hypothesis be rejected?
  • A. 90% CI 0.3 to 2.3
  • B. 97% CI -0.2 to 1.4
  • C. 90% CI -1.2 to 2.3
  • D. 95% CI -0.6 to 2.1
  • E. None of the above
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Old 11-03-2011
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is it D...cud u please explain his.. and he concept behind this..
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Old 11-03-2011
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D. 95% CI -0.6 to 2.1
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Old 11-03-2011
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The correct answer is A.
The null hypothesis can be rejected if the confidence interval does NOT include zero. Although a 95% CI is the most commonly quoted interval, this is a somewhat arbitrary selection: there are times when a CI of 99.9995% is more appropriate, and other times when a CI of 90% is most appropriate. Since we are not given details regarding this experiment, the best answer is a confidence interval that does not include zero.
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