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A battery manufacturer guarantees that his batteries will last, on average, 3 years, with a standard deviation of 1 year. His claims are based upon a very large population of his 'good' batteries. A consumer watch group decides to test his guarantee. Their small sample of his 'good' batteries indicates battery lifetimes (in years) of 1.9, 2.4, 3.0, 3.5, and 4.2. Determine the percent confidence that the difference between the watch group's sample variance and manufacture's true variance is due solely to random effects. Next, based upon the manufacturer's battery population average life time and standard deviation, determine the probabilities that a battery lifetime will be less than 1.9 years and between 3 and 4 years.
the compression ration in an air-standard otto cycle is 8. at the begining of the compression stroke the pressure is
the 2 Mg car increases its speed uniformly from rest to 25 m/s in 30s up the inclined road. determine the maximum power that must be supplied by the engine, which operates with an efficiency of 0.8. also, find the average power supplied by the eng..
Mechnical Vibration Analysis, How do I deduce the value of the viscous damping factor? How do I deduce the value of the viscous damping coefficient c?
suppose the transfer function of a controlled system is given bygsks0.1s10.01s1design a controller to this system and
Use steam tables to compute the total volume, total enthalpy, and total entropy of 1kg of water at 100o C, half by weight of which is steam and the remainder is liquid water.
a refrigerator uses refrigerant-134a as the working fluid and operates on the vapor-compression refrigeration cycle.
a projectile is launched from point a and lands on the same level at d. its maximum altitude is h. determine and plot
1. a 1000 mm long x 100 mm wide x 4 mm thick polymer plate is designed to carry a tensile load 4 kn. in the past a
a continuous gravity decanter is to separate chloro-benzene with a density of 1109 kgm3 from an aqueous wash liquid
a concentrating solar collector consists of a parabolic reflector and a collector tube of diameter d through which
if the seat pocket diameter in a ball valve is 5.000 the seat seal ring to ball sealing diameter is 4.438 and the
at an amusement park there are 200kg bumper cars a b and c. that have riders with masses of 40kg 60kg 35kg
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