9.1 Null and Alternative Hypothesis State the null and alternative hypothesis. 1. A shoe manufacturer claims that among the general adult population in the United States that the length of the left foot is longer than the length of the right foot. To compare the average length of the left foot with that of the right foot, we will take a random sample of adults and measure the length of the left foot and then the length of the right foot. Does the data indicate that the length of the left foot is greater than the length of the right foot? Last year, your company's service technicians took an average of 1.8 hours to respond to trouble calls from business customers who had purchased service c0ntracts. Do this year's data show a different average response time? We want to test whether the average grade point average in American colleges is 2.0 (out of 4.0} or not. We want to test if college students take less than five years to graduate from college, on the average. In an issue of U. 5. News and World Report, an article on school standards stated that about half of all students in France, Germany, and Israel take advanced placement exams and a third pass. The same article stated that 6.6% of U. S. students take advanced placement exa ms and 4.4 96 pass. Test if the percentage of U. 5. students who take advanced placement exams is more than 6.6%. A Tufts University study,r finds that 40% of 12th grade females feel they are overweight. Is this percent lower for college age females