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Alice has measured the hemoglobin levels of 200 people. If the data follows a normal distribution with a mean of 10 and a standard deviation of 1, what can you conclude?
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The haemoglobin levels in the sample lie between 9 and 11 (10+1).

N=200, the sample size. The standard error is (sample SD)/sqrt(N)=1/sqrt(200)=0.1/sqrt(2)=0.071 approx.

 

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