Question: Being the standard deviation and the number of data, the standard error of the mean, Sm, of a data set is: √𝑠 
 Options:  <1> 𝑆𝑚 = 𝑁 . <2> 𝑆𝑚 = 𝑠 𝑁 . 𝑁 <3> 𝑆𝑚 = √𝑠 . √𝑠 <4> 𝑆𝑚 = √𝑁 . 𝑠 <5> 𝑆𝑚 = √𝑁 .
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