If d is the standard deviation x, y, and z, what is the standard deviation of x - 5, y - 5, z - 5 ?
Select the correct option:	A) d	B) 3d	C) 15d	D) d + 5	E) d + 15
If we add or subtract a constant to each term in a set:   Mean will increase or decrease by the same constant.   SD will not change.   If we increase or decrease each term in a set by the same percent (multiply by a constant):   Mean will increase or decrease by the same percent.   SD will increase or decrease by the same percent.   So in our case SD won't change as we are subtracting 5 from each term in a set --&gt; SD=d.   dnswer: d.
<result>A</result>
If d is the standard deviation x, y, and z, what is the standard deviation of x - 5, y - 5, z - 5 ?