Is there a relation between the age difference between husband/wives and the percent of a country that is literate? Researchers found the least-squaresregression between age difference (husband age minus wife age), y, and literacy rate (percent of the population that is literate), x, is y = -0.0409x+6.9.The model applied for 21 <xs 100. Complete parts (a) through (e) below. (a) Interpret the slope. Select the correct choice below and fill in the answer box to complete your choice.