A company is researching the effectiveness of a new website design to decrease the time to access a website. Five websites users were randomly selected and their times (in seconds) to access the website with the old and new designs were recorded. These results follow users a old 30 new 15, b old 45 new 20, c old 25 new 10, d old 32 new 25, e old 28 new 20. Let a= 0.05. Is the mean time to access the new website shorter, or is (time for the old design - time for the new design) greater than zero? Explain your answer in items of the null hypothesis.