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Problem: Checking the randomization. If the random assignment of patients to treatments did a good job of eliminating bias, possible lurking variables such as smoking history, asthma, and hay fever should be similar in all four groups. After recording and comparing many such variables, the investigators said that "all showed no significant difference between groups." Explain to someone who knows no statistics what "no significant difference" means. Does it mean that the presence of all these variables was exactly the same in all four treatment groups?
A hall probe is constructed of semiconductor material having a charge-carrier density of 1021m-3. What is the sensitivity of the Hall probe
The figure below shows three point charges that lie in the x,y plane in a vacuum. Find the magnitude and direction of the net electrostatic force on the charge q2 due to the charges q1 and q3.
A skateboarder shoots off a ramp with a velocity of 6.80m/s, directed at an angle of 59° above the horizontal. The end of the ramp is 1.10 m above the ground.
As olenoid with 600 turns has a radius of .04 m and is 40cm long. If this solenoid carries a current of 12 A. what is the magnitude of the magnetic field at the center of solenoid.
A toaster uses a heating wire. When the toaster is turned on at 20 degree C, the initial current is 1.54 A. A few seconds later, the toaster warms up and the current has a value of 1.23 A. The average temperature coefficient of resistivity for thi..
you need to make a series ac circuit having a resonance angular frequency of 1525 rads using a 138 ohm resistor a 10.5
A 55 Kilogram gymnast hangs vertically from a pair of parallel rings. If the ropes supporting the rings are attached to the ceiling directly above, evaluate what is the tension in each rope
The centers of a 13.0 kglead ball and a 50.0 g lead ballare separated by 11.0 cm. What gravitational force does each exert on the other
Optimus Prime is flying straight up at 75m/s when he accidentally drops his mega-ray blaster and it falls58 m to the ground below. Calculate how long it takes for his mega-ray blaster to hit the ground.
A conductor is suspended by two flexible wires has a mass per unit length of 0.04 kg/m. What is the required direction for the current
A bullet of mass 6 g strikes a ballistic pendulum of mass 1.8 kg. The center of mass of the pendulum rises a vertical distance of 12 cm. Assuming that the bullet remains embedded in the pendulum, Compute the bullet's initial speed, m/s
A storage tank has a diameter of 80 ft, a height of 25 feet, and contains oil to a height of 15 ft. The suction pumps, whichcan handle 15, 000 bbl/d are started, but the safety valves areclogged and a vacuum is drawn in the tank. The roof is flata..
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