Null and alternative hypothesis for testing
Report shows that 45% of all US households owned 2 cars in 2000. Set up the null and alternative hypothesis for testing whether the percentage of households cars has
a) changed since 2000
b) increased since 2000
c) decrease since 2000
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Assuming that the population proportion p is near 0.3, find the sample size required to construct 90% confidence interval for p with margin of error 0.03. Repeat the same calculations if p is close to 0.5.
Electronic devices use electrical energy even when they are on standby. Calculate the percent of energy used per day for the following entertainment equipment in the standby mode assuming that they are plugged in all the time.
A steady flow of 15 kg/s of high-pressure liquid oil drives a hydraulic motor at the steady-state-steady-flow conditions shown below. Find the diameter of the exit pipe, and the power output, Wcv & out?
The heat capacity of silver, measured at a temperature of 4 K, is 0.0134 J/(mole ·K). The Debye temperature of silver is 225 K. What are the electronic contribution (J/(mole ·K)) to the heat capacity of silver at 2 K?
The average plate temperature of a ?at plate of length L with constant heat ?ux with air at 20? C ?owing over it at a certain velocity was found to be 50 ? C. What is the temperature at the trailing edge of the plate?
Air at 15 ? C ?ows over a ?at plate. A heater strip 10 cm long is placed on the plate at a distance 15 cm from the leading edge. The local heat transfer coe?
The Sun radiates about 3.83x1026 W of power. How large should a perfectly reflecting solar sail be on a space ship of mass 50 kg to provide an acceleration of 10-4 m/s2 at the Earth's orbit? The radius of Earth's orbit is 1.50 x 1011 m.
The old style heating uses steam (or hot water) in an radiator to heat a room in winter time. A radiator can be considered as a vertical surface 0.5 meter high and 1 meter wide. The surface temperature of the radiator is 70 ?
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