The mean lifetime for cardiac stents is 8.9 years

Question # 00621980 Posted By: rey_writer Updated on: 11/25/2017 11:39 AM Due on: 11/25/2017
Subject Statistics Topic General Statistics Tutorials:
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hypothesis testing on biostatistics

1. 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 a statistical evidence of a prolonged lifetime of the stents? Run the test at a 5% level of significance.

2. The Table below displays descriptive statistics on subjects involved in a clinical trial. Are any of the characteristics significantly different between groups? Justify briefly.

New Compound Placebo p-value

Mean age (years) 47.2 46.1 0.7564

Men (%) 44 59 0.0215

Mean educational level (years) 13.1 14.2 0.6898

Mean annual income $36,560 $37,470 0.546

Mean body mass index (BMI) 24.7 25.1 0.0851

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  1. Tutorial # 00620671 Posted By: rey_writer Posted on: 11/25/2017 11:39 AM
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