An experiment involves selecting a random sample of 256 middle managers at random for study. one item of interest is their mean annual income. the sample mean is computed to be $35,420 and the sample standard deviation is $2,050. what is the standard error of the mean?

The perimeter of a rectangle is 40 inches. the table shows some of the possible dimensions for the length and area of the rectangle. length (inches) area (square inches) 2 36 7.5 93.75 10 100 12.5 93.75 18 36 given that the area of the rectangle is dependent on the length of its sides, which graph could best be used to display the relationship shown in the table?