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#1
11-02-2011
 USMLE Forums Addict Steps History: Not yet Posts: 191 Threads: 96 Thanked 271 Times in 97 Posts Reputation: 281
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
 The above post was thanked by: dr.muhamad (11-03-2011), Faith32 (11-02-2011), heman466s (11-03-2011)

#2
11-03-2011
 USMLE Forums Guru Steps History: Not yet Posts: 404 Threads: 108 Thanked 71 Times in 48 Posts Reputation: 80

is it D...cud u please explain his.. and he concept behind this..
#3
11-03-2011
 USMLE Forums Master Steps History: --- Posts: 1,203 Threads: 180 Thanked 1,254 Times in 441 Posts Reputation: 1268

D. 95% CI -0.6 to 2.1

#4
11-03-2011
 USMLE Forums Addict Steps History: Not yet Posts: 191 Threads: 96 Thanked 271 Times in 97 Posts Reputation: 281

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.
 The above post was thanked by: Faith32 (11-03-2011)

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