Percentages of public school students in fourth grade in 1996 and in eighth grade in 2000 who were at or above the proficient level in mathematics are given for eight western states. Find the equation of the least-squares line that summarizes the relationship between x = 1996 fourth-grade math proficiency percentage and y = 2000 eighth-grade math proficiency percentage. (Give the answer to three decimal places.) = State Arizona California Hawaii Montana New Mexico Oregon Utah Wyoming 4th grade 8th grade (1996) (2000) 16 25 12 22 17 20 23 41 14 17 22 36 30 29 24 20