Lisa is examining a two-way table representing the sales of juice packaged in bottles with an old or new label. In the table, p, q, r, and s are the number of bottles sold or left on the grocery store shelf last thursday. Sales of juice bottles sold left on the shelf new label p q old label r s comparing which two values will determine whether the new label had an impact on sales? p and q p and r startfraction p over p + r endfraction and startfraction q over q + s endfraction startfraction p over p + q endfraction and startfraction r over r + s endfraction.