Which of the following is true about the sampling distribution of the sample mean?

ITS 1 of these answers.


1)The standard deviation of the sampling distribution is always 蟽.


2)The shape of the sampling distribution is always approximately normal.


3)The mean of the sampling distribution is always 碌.


4)All of the above are trueWhich of the following is true about the sampling distribution of the sample mean?
Number ( 2 ) is true.