A survey of randomly selected college students found that 47 of the 114 freshmen and 57 of the 100 sophomores surveyed had purchased used textbooks in the past year. Construct a 98% confidence interval for the difference in the proportions of college freshmen and sophomores who purchased used textbooks.

Which of the statements about the graph of the function y = 2x are true? check all of the boxes that apply. the domain is all real numbers x because the exponent of 2 can be any real number when the x-values increases by 1 unit, the y-value multiplies by 2. the y-intercept is (0, 1). the graph never goes below the x-axis because powers of 2 are never negative. the range is all real numbers.