Let$$s suppose that the leftmost bit of our $4$ bit number is used to signify whether the number is

positive using $0$ or negative using $1.$

For example, $0101$ represents positive $5$ and $1101$ represents $-5.$ This is called a signed integer.

What is the range of values for a $4$ bit signed integer and how does it$$s size compare to the range of

values of the unsigned integer?