coltonnorwood1423 coltonnorwood1423

15-11-2022
Mathematics

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3. the mean lifetime for cardiac stents is 8.7 years. a medical device company has implemented some improvements in the manufacturing process and hypothesizes that the lifetime is now longer. a study of 100 new devices reveals a mean lifetime of 9.3 years with a standard deviation of 3.8 years. is there statistical evidence of a prolonged lifetime of the stents?

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