a high school senior is concerned about attending college because she knows that many college students require more than 4 years to complete a bachelors degree. at the 0.10 level of significance, test the claim of her guidance counselor who states that the mean time required to complete a bachelors degree is greater than 5 years. sample data from 500 randomly selected college graduates consists of a mean of 5.15 years with a standard deviation of 1.68 years