Like any seeds, watermelon seeds lose their viability over time. If they've been left sitting for years, it's possible that only a small proportion of the seeds may sprout when planted. If they have been stored in a cool, dark, dry location, they have a better chance of sprouting. Drake has a large quantity of old watermelon seeds he's been saving, and now wants to know how many of them may still be able to sprout.He randomly selects 100 seeds from the set, places them between damp paper towels, and puts them in a plastic baggie in a warm spot on the counter. He finds that 58 out of the 100 seeds do sprout. Does this provide good evidence that over half of all of the seeds will sprout?

What is the value of z, the test statistic, for this test? (Round your answer to two decimal places.)