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? What is the appropriate test statistic? What is the decision rule value if the level of significance is .05—Reject H0 if z ≥ ______ What is the value of your test statistic (z)? (round to 2 decimal places)

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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Chapter1: Starting With Matlab
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  1. 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?
    1. What is the appropriate test statistic?
    2. What is the decision rule value if the level of significance is .05—Reject H0 if z ≥ ______
    3. What is the value of your test statistic (z)? (round to 2 decimal places)
    4. What is the conclusion of your hypothesis test?
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