The director of research and development is testing a new medicine. She wants to know if there is evidence at the 0.02 level that the medicine relieves pain in more than 312 seconds. For a sample of 65 patients, the mean time in which the medicine relieved pain was 314 seconds. Assume the population standard deviation is 23. Step 1 of 6: State the null and alternative hypotheses. answer 田 Tables 画 Keypad Keyboard Shortcuts Ho: Ha:

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