Standard error of the sample proportion
A sample of size 500 gave a sample proportion of 0.3. What is the standard error of the sample proportion? Give your answer to four decimal places.
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A person pulls a toboggan for a distance of 20.0 m along the snow with a rope directed 30.0° above the snow. The tension in the rope is 95.0 N. (a) How much work is done on the toboggan by the tension force?
A sample of size 100 has a sample standard deviation of 25. What is the standard error of the sample mean? Give your answer to one decimal place.
Assume you can measure the weight of the king's crown in air, Wa, and the weight in water, Ww. Express the specific gravity of the crown as a function of these measured values.
In an ionic solution, 5.8 x 1015 positive ions with charge +2e pass to the right each second while 6.3 x 1015 negative ions with charge -e pass to the left. What are the magnitude and direction of current in the solution?
The brakesand coasts down the grade with an acceleration in feet per second squared given by a=3.22?0.004v2, where v is the velocity in feet per second. Determine the velocity vB at the bottom B of the grade.
A banking consultant is investigating if the proportion of households with saving above $20,000 has increased from last year's value of 0.2. In a random sample of 200 households, 50 had savings of more than $20,000. What is the p-value for the tes
In being launched from rest it moves through a distance of 87 m and has a kinetic energy of 5.40 x 107 J at lift-off. What is the work done on the jet by the catapult?
In the reservoir of a supersonic wind tunnel, the pressure and temperature of air are 10 atm and 320 K, respectively. Calculate the density, the number density, and the mole-mass ratio.
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