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The best painkiller for children. A Washington Post article reported a study comparing the effectiveness of three common painkillers for children. Three hundred children, aged 6 to 17, were randomly assigned to three groups. Group A received a standard dose of ibuprofen. Group B received a standard dose of acetaminophen. Group C received a standard dose of codeine. The youngsters rated their pain on a 100-point scale before and after taking the medicine.
(a) Outline the design of this experiment. You do not need to do the randomization that your design requires.
(b) You read that "the children and physicians were blinded" during the study. What does this mean?
(c) You also read that there was a significantly greater decrease in pain ratings for Group A than for Groups B and C, but there was no significant difference in the decrease of pain ratings for Groups B and C. What does this mean? What does this finding lead you to conclude about the use of ibuprofen as a painkiller?
a 71 kg baseball lplayer jumps straight up to catch a line drive. If the 140 g ball is moving horizontally at 28 m/s and the catch is made when the ball player is at the highest point of his leap what is his speed immediately after stopping the ba..
A block of unknown mass is attached to a spring of spring constant 5.1 N/m and undergoes simple harmonic motion with an amplitude of 15.4 cm. Calculate the mass of the block
Presume an apparatus (vacuum tube) is turned on to a constant voltage of 200V. A beam will now be observed on the glass envelope opposite the anode. Adjusting the current, I through the coil would show how the beams curves up into the sphere of the t..
The body contains many small currents caused by the motion of ions in the organs and cells. Measurements of the magnetic field around the chest due to currents in the heart give values of about 1.0 µG. how large is the current in the heart
A very long, straight cylindrical conductor with radius R and length L carries a uniformly distributed net charge Q. What are the bound surface charge densities at r = 2R and at r = 4R
A 2.5 kilogram solid sphere (radius = 0.10 meter) is released from rest at the top of a ramp and allowed to roll without slipping. Determine its total kinetic energy
A compound microscope has a barrel whose length is 16.4 cm and an eyepiece whose focal length is 1.7 cm. What focal length must the objective have so the angular magnification of the microscope is -250
A cylindrical specimen of aluminum with a diameter of 19 mm and length of 200 mm is deformed elastically by applying a tensile force of 7.0x10^3 N parallel to the cylinder axis. Determine the change in diameter of the specimen (in mm).
It is found that a uniform amount of electrical flux is going through each region of a Gaussian surface shaped like a cube. What amount of charge is there inside the sphere
Use the information you obtained from your graph to determine the total mass of the system M = m1 + m2. Using the information you obtained in parts (a) and (b), predict what the value of the acceleration would be if the value of the hanging mass we..
what is the definition of frequency distribution
in a simple model of the hydrogen atom the electron revolves in a circular orbit around the proton with a speed of
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