Mathematics, 11.11.2019 20:31, stressedstudent101

The mean lifetime for cardiac stents is 8.9 years. a medical device company has implemented some improvements in the manufacturing process and hypothesizes that the lifetime is now longer. a study of 40 new devices reveals a mean lifetime of 9.7 years with a standard deviation of 3.4 years. is there statistical evidence of a prolonged lifetime of the stents?

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The mean lifetime for cardiac stents is 8.9 years. a medical device company has implemented some imp...