Question

Ramona used the regression equation y = 444x - 21.29, Ramona determined that her answer was incorrect

where x represents height and y represents shoe size, to because a man who is -17.52 inches tall does not

predict the approximate height of a man who wears a

make any sense. What was Ramona's mistake?

size 8.5 shoe

She substituted the 8.5 for the wrong variable.

1. y = 444(8.5) - 21.29

She should have added 444 and 8.5.

2 y = 3.774 - 21.29

The value for y should be positive.

3 y=-17.52

The solution of -17.52 should be the shoe size

Answer 1

a

Explanation:

Answer 2

She substituted the 8.5 for the wrong variable.

Explanation:

The 8.5 refer to shoes size, not height. So, replacing 8.5 for the x-variable is wrong, because x refers to height and y represents shoe size.

Therefore, Ramon just substituted the 8.5 for the wrong variable. She must replace 8.5 for y-variable, because that's the right one for shoe size.