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Observation or experiment? The Nurses' Health Study has queried a sample of over 100,000 female registered nurses every two years since 1976. Beginning in 1980, the study asked questions about diet, including alcohol consumption. The researchers concluded that "light-to-moderate drinkers had a significantly lower risk of death" than either nondrinkers or heavy drinkers.
(a) Is the Nurses' Health Study an observational study or an experiment? Why?
(b) What does "significant" mean in a statistical report?
(c) Suggest some lurking variables that might explain why moderate drinkers have lower death rates than nondrinkers. (The study did adjust for these variables.)
90 degrees or 1.5708 radians. If the two microphones were at the same distance from the speaker, the two signals would be in phase: they would lie on top of each other. For the phase dissimilarity shown, what is the minimum distance flanked by the tw..
Determine how many turns of wire would be required to make a 120-mH inductor out of a 27 centimeter long air-filled solenoid with a diameter of 6.5 centimeter
Suppose a star with radius 8.39 multiply.gif 108 m has a peak wavelength of 686 nm in the spectrum of its emitted radiation. What is the surface temperature of the star
A crate of mass 14.0 kg is pulled upa rough incline with an initial speed of 1.50 m/s. How much mechanical energy is lost due to friction
A 40.0-kg boy, riding a 2.50-kg skateboard at a velocity of +5.30m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocityrelative to the sidewalk is 6.00 m/s, 9.50o abovethe hori..
A string with a length of 0.8m is fixed at both ends. what is the frequency associated with its longest wavelength
A neutron star will be detected from Earth as a pulsar by itsregular radio pulses only if. What is believed to be the maximum mass for a neutronstar?
The height of a helicopter above the ground is given by h = 2.95t^3, where h is in meters and t is in seconds. At t = 2.50 s, the helicopter releases a small mailbag.
A mass of 200 grams stretches a spring 5 cm. The mass is the set in motion from its equilibrium position with an initial downward velocity of 20 cm/sec. assuming that there is no damping, decide the position of the mass at any time t, and decide the ..
A 1050kg car carrying four 78kg people travels over a rough "washboard" dirt road with corrugations 4m apart which causes car to bounce on its spring suspension.
the charge on a capacitor increases by 16mu c when the voltage across it increases from 92v to 127v . what is the
A typical American house requires an average 20 kW for heating. Explain how many homes could be heated with the waste heat of this one power plant?
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