Question 27
A pharmaceutical company claims that its new drug reduces systolic blood pressure by an average of 10 mmHg, with a known standard deviation of 2 mmHg. A medical researcher believes that the drug may be less effective than claimed. To test this claim, she conducts a study on a random sample of 64 patients and measures the reduction in systolic blood pressure after using the drug for 2 weeks. The researcher decides to reject the company's claim if sample mean and accept it otherwise. Based on the above data, answer the given subquestions.