The director of research and development is testing a new medicine. She wants to know if there is evidence at the 0.05 level that the medicine relieves pain in more than 331 seconds. For a sample of 53 patients, the mean time in which the medicine relieved pain was 336 seconds. Assume the variance is known to be 361. Step 2 of 5: Enter the value of the z test statistic. Round your answer to two decimal places. Answer Tables Keypa How to enter your answer (opens in new window) Keyboard Short Previous step answ