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The service life of a battery used in a cardiac pacemaker is assumed to be normally distributed. A random sample of 10 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: 25.5, 26.1, 26.8, 23.2, 24.2, 28.4, 25, 27.8, 27.3, and 25.7. a) The manufacturer wants to be certain that the mean battery life exceeds 25 h. What conclusions can be drawn from these date (use alpha = 0.05)? b) Construct a 90% two-sided confidence interval on mean life in the accelerated test. c) Construct a normal probability plot of the battery life data. What conclusions can you draw?
consider some hypothetical x - y - ion pair for which the equilibrium interionic spacing and bonding energy values are
Friction between the piston and cylinder wall can be neglected because the process occurs so slowly. For the air, determine the initial and final pressures in kPa and the boundary work for the process in kJ.
A power plant operates a regenerative Rankine cycle with a reheat, one closed and one open feedwater heater and has a net power output of 1.2 x 109 Btu/hr.
explain the factor, which inhibit the use of a very high resolution and a large number of colors for display in the case of raster scanning display devices.
Using the required parameters for a typical large size car* and an appropriate frontal Quarter-Car model.
calculate the transverse modulus of the peek/carbon fiber composite with 30% volume fraction by tow method. the modulus of peek is 3.8 GPa and the modulus of the carbon fiber is 400GPa. assume the reinforcing factor.
air is compressed in an isentropic process from an initial pressure and temperature of p 1 90 kpa and t1 22 oc to a
question a person of weight 100 kg standing on skis 2 m long and 0.10 in wide slides on the 2deg mountain slope at
steam at 160 bar 480degc enters a two-stage turbine operating at steady sate with a volumetricnbspflow rate of 800
Whats are examples of destructive tests and non destructive
which acitivities does hydraulic analysis of a pipeline include using HYSYS software? what data can obtained?
a pitot-static probe connected to a water manometer is used to measure the velocity of air. if the de?ection
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