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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?
Radar at an airport tells an air traffic controller that a light airplane is approaching at 220 km/h at 33° north of east. Instruments also tell the air traffic controller that there is a wind blowing at 42 km/h at 25° west of south. What is th..
a river flows due eat at 1.50 ms. a boat crosses the river from the south shore to the north shore by maintaining a
Write down the condition that determines l1. Suppose now that the spring is stretched a further distance x beyond its new equilibrium length. Show that the net force (spring plus gravity) on the mass is F = -kx. That is, the net force obeys Hook..
A particle with a mass of1.5010-20kg is oscillating with simple harmonic motion with a period of 1.0010-5s and a maximum speed of 3.50103 m/s. Calculate the maximum displacement of the particle
how many drops of water are in all the oceans on earth? assume that 1cm3 contains 25 drops of water. remember that this
The distance to a star is approximately 4.50 x 1018 meter. If this star were to burn out today, in how many years would we see it disappear
At what distance along the central axis of a ring of radius 1.8 cm and uniform charge 66 C is the magnitude of the electric field maximum.
A spring with a spring constant 23 N/m is suspended vertically. (Assume the mass of the spring is negligible), How much does the spring stretch (in cm) when 236 g is added? The spring is then set into vertical oscillation from its equilibrium positio..
A 0.25-kg block rests on a friction-less wedge that has an inclination of 71 degrees and acceleration to the right such that the mass remains stationary relative to the wedge. Find the acceleration
Which one of the following statements regarding internal energy is FALSE?
A football of mass0.420 kg is thrown 60 m by a quarterback who imparts to it an initial velocity at an angle of 45 degrees above the horizontal. what force does his hand exert on the ball
A 20.0 ft horizontal arm is uniform and weighs 50.0 lbs. Find the tension in the cable and the horizontal and vertical forces at the hinge for a load of 500 lbs located 5.00 ft from the right end as shown.
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