Estimate the population mean
A population is estimated to have a standard deviation of 13. We want to estimate the population mean within 3, with a 99 percent level of confidence.
How large a sample is required?
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A magnetic field increases from 0 to 0.12 T in 1.8 s. How many turns of wire are needed in a circular coil 14 cm in diameter to produce an induced emf of 5.4 V?
Find the peak emf in this coil when it's rotating at 110Hz in a strong 6.6T field. Express your answer to one significant figure and include the appropriate units.
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The estimate of the population proportion is to be within plus or minus .05, with a 99 percent level of confidence. The best estimate of the population proportion is .19. How large a sample is required?
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What is the present value at a 10% discount rate of the depreciation tax shield for a firm in the 35% tax bracket that purchases a $50,000 asset being depreciated straight-line over a 5-year life to a zero salvage value?
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A resistor connected across an AC power supply has a current given by I = (1.15A) cos (300t) when connected to a power supply with emf 120V rms. a) Find the rms current. b) Find the resistance. c) Find the average power delivered to the resistor.
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