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)What is the conclusion of your hypothesis test?

Given data : sample size, n = 100 sample mean, x̄ = 9.3 population standard…

Answered: The mean lifetime for cardiac stents is…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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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?

Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...

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