I need help analyzing each function.

y=x^2+3

For each  x -value, there is only one  y -value. It is a function.

Step-by-step explanation: This is the equation of a parabola. It does represent a function.  For any  x value you choose, there will be only one  y value.  You will not end up with a choice of  y - values.  If you draw the graph and draw a vertical line anywhere, it will only intersect the parabola once. This is an indication that is is a function.

an advantage of the standard deviation is that it increases as the dispersion of the data increases. e. the interquartile range is preferred when the data are not skewed or no have outliers. an advantage of the standard deviation is that it uses all the observations in its computation.