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 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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