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The Department of Labor would like to estimate the average weekly wages for US adults with a margin of error equal to $20. Determine the sample size needed to construct a confidence interval for this estimate using the following confidence levels. Assume the population standard deviation for the weekly average is $160.
a. 90%
b. 95%
c. 98%
d. Explain why the confidence level effects the sample size needed to obtain a particular margin of error?
In the Bohr model of the hydrogen atom, an electron (mass m=9.1×10^?31kg) orbits a proton at a distance of 5.3×10^?11m. How many revolutions per second does the electron make
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The drawing shows a rectangular block of glass (n = 1.52) surrounded by a liquid with n = 1.73. At what angle does the ray leave the glass at point B
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if the radius of the equipotential surface of a point charge is 10.5 m, what are the magnitude and sign of the point charge
A 25.1-mW laser beam of diameter 2.15 mm is reflected at normal incidence by a perfectly reflecting mirror. Calculate the radiation pressure on the mirror
Suppose that a comet that was seen in 627 A.D. by Chinese astronomers was spotted again in year 1988. determine the semimajor axis of the comet's orbit
An electron in a vaccuum is first accelerated by a voltage of 10,000 volts, find the force of the electron due to the magnetic field
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