75. To estimate the difference in the proportion of students at high school A and high school B who
drive themselves to school, a district administrator
selected a random sample of 100 students from each
school. At school A, 23 of the students said they
drive themselves; at school B, 29 of the students said
they drive themselves. A 90% confidence interval
for pa - þB is -0.16 to 0.04. Based on this interval,
which conclusion is best?