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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 automobile having a mass of 1,000 kg is driven into a brick wall in a safety test. The bumper behaves like a spring with constant 5.40 106 N/m and is compressed 3.58 cm as the car is brought to rest. What was the speed of the car before impact, as..
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A 7 L rigid (constant volume) container holds 0.81 moles of helium at an initial temperature of 75 oC. How many moles of gas will be in the container at the final temperature
The figure below shows a circuit with a battery and 3resistors. The resistors have values of 4 Ω, 3Ω and6Ω as shown. The battery is 18 V. Calculate the equivalent resistance of the combination of resistors and the current in each resistor, the cu..
one of the loudest sounds in recent history was that made by the explosion of krakatoa on august 26-27 1883. according
Light passes from a crown glass container into water. If the angle of refraction is 40o, what is the angle of incidence
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