You measure 64 children, obtaining a X of 57.28. Slug says that bc this X is so close to the mean of 56, this sample could hardly be considered gifted .

Question

You measure 64 children, obtaining  a X of 57.28. Slug says that bc this X is so close to the mean of 56, this sample could hardly be considered  gifted .  
A. Perform  the  appropriate  statical procedure  to determine  whether  he is   correct.
B. In what percentage  of the top scores is this sample mean?

PsyDAG · Answer

Need standard deviation (SD) value.

Z = (score-mean)/SEm

SEm = SD/√n

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to Z score.