3. The service life of a battery used in a cardiac pacemaker is assumed to be...

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3. The service life of a battery used in a cardiac pacemaker is assumed to be nomally distrībuted A sample of twelve batteries is subjected to an accelerated life test by running them continuously at an elevated temperature until failure, and the following lifetimes (in hours) are obtained: 24.6, 25.3, 25.8, 24.4, 26.4, 25.4, 24.5, 26.1, 24.5, 24.9, 26.0, and 24.7. Test the hypothesis that the mean battery life exceeds 25 hours. a) State the null and alternative hypothesis. b) Compute the test statistics. c) Compute the P-value. I d) State a conclusion 3. The service life of a battery used in a cardiac pacemaker is assumed to be nomally distrībuted A sample of twelve batteries is subjected to an accelerated life test by running them continuously at an elevated temperature until failure, and the following lifetimes (in hours) are obtained: 24.6, 25.3, 25.8, 24.4, 26.4, 25.4, 24.5, 26.1, 24.5, 24.9, 26.0, and 24.7. Test the hypothesis that the mean battery life exceeds 25 hours. a) State the null and alternative hypothesis. b) Compute the test statistics. c) Compute the P-value. I d) State a conclusion