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Quick randomizing
Problem: Here's a quick and easy way to randomize. You have 100 subjects, 50 women and 50 men. Toss a coin. If it's heads, assign all the men to the treatment group and all the women to the control group. If the coin comes up tails, assign all the women to treatment and all the men to control. This gives every individual subject a 50-50 chance of being assigned to treatment or control.
Required:
1. Why isn't this a good way to randomly assign subjects to treatment groups?
An aluminum cylinder with radius 2.3cm and length 19cm is heated to 430 degrees C. Find the net power this cylinder radiates into a room
Written Threat Assessment: You are to assume the role of a US federal agency intelligence analyst who is putting together the agency's input (on your specific topic) for the DNI's Annual Threat Assessment, which will be presented to Congress. Therefo..
two filaments of current infinitely long and strait that have current with the same magnitude. find the magnetic field
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A 0.54-kg block is hung from and stretches a spring that is attached to the ceiling. What is the mass of the second block
An electron is in circular motion of with a speed of 2 x 104 meter per second while in a 40 mT magnetic field. Determine the diameter of the circular trajectory
A parallel-plate capacitor with circular plates of radius R is being charged. The change of electric field is given by dE/dt=1.5E12 V/(mS). The field magnitude B for r=5R is 1E-7 T.
Find the horizontal component of the average force on the ball. Take the x-direction to be positive to the right. Find the vertical component of the average force on the ball.
The wavelength of visible light ranges from 400 {\rm nm} to 700 {\rm nm}. Find the ranges of this light's angular frequency
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A kicker punts a football from the very center of the field to the sideline 36 yards downfield. What is the direction of the net displacement of the ball
An observer inside the building notices that it takes 0.15s for the tile to pass her window, whose height is 2.20m. How far above the top of this window is the roof.
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