homework statistics
posted by Jackay 70 .
Consider a random sample with sample mean x. If the sample size increased from n = 40 to n = 360, then the standard deviation of x will:
a. remain the same
b. increase by a factor of 9 (will be multiplied by 9)
c. decrease by a factor of 9 (will be multiplied by 1/9)
d. decrease by a factor of 3 (will be multiplied by 1/3)

Try some of the statistics tutorials:
http://www.google.com/search?q=statistics+tutorials&ie=utf8&oe=utf8&aq=t&rls=org.mozilla:enUS:official&client=firefoxa
Sra 
Assuming that you are referring to the standard deviation and not the standard error of the mean, the standard deviation will remain essentially the same.