Posted on September 13, 2015 by Archer USMLE Reviews

**You are reading a study that was conducted to evaluate IQ (intelligence quotient) scores for patients with bipolar disease. Ten patients did not complete the test. Two patients refused to begin the test. Results for the 94 patients who completed the test revealed an average IQ of 130 with a standard deviation of 20. Which of the following best represents the 95% confidence interval for this study?**

**4**
**2**
**1**
**.05**
**.1**

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Filed under: USMLE STEP III QUESTION BANK, USMLE Test Prep | Tagged: Archer Bio-statistics, USMLE Step 3 Bio-statistics |

laurentiu244, on September 14, 2015 at 2:24 pm said:A

seb, on February 1, 2016 at 4:53 pm said:dr archer please leave explanation on how to calculate C.I, thank you

ALI HUSSAIN, on April 1, 2016 at 10:45 am said:for 95 ci we have z value of 1.96 sample size is 94 and sd is 2 so

formula is Zx sd/underroot of sample size

underroot of 94 is 9.6

answer is 4

Julian, on November 14, 2016 at 5:46 pm said:A

Julian, on November 14, 2016 at 5:47 pm said:1. 4