there a relation between the age difference between husband/wives and the percent of a country that is literate? esearchers found the least-squares regression between age difference (husband age minus wife age), y, and litera te (percent of the population that is literate), x, is = -0.0574x+8.3. The model applied for 19x 100. Complete arts (a) through (e) below. ) Interpret the slope. Select the correct choice below and fill in the answer box to complete your choice. or every unit increase in the ype an integer or decimal. Do not round.) falls by units, on average. literacy rate